Migrate to Auth0 as Identity Provider

This pull request removes the hard dependency on Google for 
authenticating users and migrates to Auth0 as Identity Provider for OpenDC. 
This has as benefit that we can authenticate users without having to manage 
user data ourselves and do not have a dependency on Google accounts anymore. 

- Frontend cleanup:
   - Use CSS modules everywhere to encapsulate the styling of React components.
   - Perform all communication in the frontend via the REST API (as opposed to WebSockets).
      The original approach was aimed at collaborative editing, but made normal operations 
      harder to implement and debug. If we want to implement collaborative editing in the 
      future, we can expose only a small WebSocket API specifically for collaborative editing.
   - Move to FontAwesome 5 (using the official React libraries)
   - Use Reactstrap where possible. Previously, we mixed raw Bootstrap classes with 
      Reactstrap, which is confusing.
   - Reduce the scope of the Redux state. Some state in the frontend application can be 
      kept locally and does not need to be managed by Redux.
   - Migrate from Create React App (CRA) to Next.js since it allows us to pre-render
      multiple pages as well as opt-in to Server Side Rendering.
   - Remove the Google login and use Auth0 for authentication now.
   - Use Node 16
- Backend cleanup:
   - Remove Socket.IO endpoint from backend, since it is not needed by the frontend 
      anymore. Removing it reduces the attack surface of OpenDC as well as the maintenance efforts.
   - Use Auth0 JWT token for authorizing API accesses
   - Refactor API endpoints to use Flask Restful as opposed to our custom in-house 
      routing logic. Previously, this was needed to support the Socket.IO endpoint, 
      but increases maintenance effort.
   - Expose Swagger UI from API
   - Use Python 3.9 and uwsgi to host Flask application
- Actualize OpenAPI schema and update to version 3.0.

**Breaking API Changes**

* This pull request removes the users collection from the database table. Instead, we now use the user identifier passed by Auth0 to identify the data that belongs to a user.

12 files changed, 63 insertions, 60 deletions

diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/AddPrefabComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/AddPrefabComponent.js
index 75418f9d..d0218f38 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/AddPrefabComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/AddPrefabComponent.js
@@ -1,10 +1,13 @@
 import React from 'react'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faSave } from '@fortawesome/free-solid-svg-icons'
+import { Button } from 'reactstrap'
 
 const AddPrefabComponent = ({ onClick }) => (
-    <div className="btn btn-primary btn-block" onClick={onClick}>
-        <span className="fa fa-floppy-o mr-2" />
+    <Button color="primary" block onClick={onClick}>
+        <FontAwesomeIcon icon={faSave} className="mr-2" />
         Save this rack to a prefab
-    </div>
+    </Button>
 )
 
 export default AddPrefabComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/BackToRoomComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/BackToRoomComponent.js
index c14775bf..f6a6f79b 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/BackToRoomComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/BackToRoomComponent.js
@@ -1,10 +1,13 @@
 import React from 'react'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faAngleLeft } from '@fortawesome/free-solid-svg-icons'
+import { Button } from 'reactstrap'
 
 const BackToRoomComponent = ({ onClick }) => (
-    <div className="btn btn-secondary btn-block mb-2" onClick={onClick}>
-        <span className="fa fa-angle-left mr-2" />
+    <Button color="secondary" block className="mb-2" onClick={onClick}>
+        <FontAwesomeIcon icon={faAngleLeft} className="mr-2" />
         Back to room
-    </div>
+    </Button>
 )
 
 export default BackToRoomComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/DeleteRackComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/DeleteRackComponent.js
deleted file mode 100644
index 23b0daac..00000000
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/DeleteRackComponent.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import React from 'react'
-
-const DeleteRackComponent = ({ onClick }) => (
-    <div className="btn btn-outline-danger btn-block" onClick={onClick}>
-        <span className="fa fa-trash mr-2" />
-        Delete this rack
-    </div>
-)
-
-export default DeleteRackComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/EmptySlotComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/EmptySlotComponent.js
index d7e30f1d..d6fa9dc9 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/EmptySlotComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/EmptySlotComponent.js
@@ -1,13 +1,18 @@
 import React from 'react'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faPlus } from '@fortawesome/free-solid-svg-icons'
+import { ListGroupItem, Badge, Button } from 'reactstrap'
 
 const EmptySlotComponent = ({ position, onAdd }) => (
-    <li className="list-group-item d-flex justify-content-between align-items-center">
-        <span className="badge badge-default badge-info mr-1 disabled">{position}</span>
-        <button className="btn btn-outline-primary" onClick={onAdd}>
-            <span className="fa fa-plus mr-2" />
+    <ListGroupItem className="d-flex justify-content-between align-items-center">
+        <Badge color="info" className="mr-1">
+            {position}
+        </Badge>
+        <Button color="primary" outline onClick={onAdd}>
+            <FontAwesomeIcon icon={faPlus} className="mr-2" />
             Add machine
-        </button>
-    </li>
+        </Button>
+    </ListGroupItem>
 )
 
 export default EmptySlotComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineComponent.js
index caa3dc04..36b15c71 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineComponent.js
@@ -1,13 +1,16 @@
 import React from 'react'
-import Shapes from '../../../../../shapes'
+import Image from 'next/image'
+import { Machine } from '../../../../../shapes'
+import { Badge, ListGroupItem } from 'reactstrap'
 
 const UnitIcon = ({ id, type }) => (
-    <div>
-        <img
+    <div className="ml-1">
+        <Image
             src={'/img/topology/' + id + '-icon.png'}
             alt={'Machine contains ' + type + ' units'}
-            className="img-fluid ml-1"
-            style={{ maxHeight: '35px' }}
+            layout="intrinsic"
+            height={35}
+            width={35}
         />
     </div>
 )
@@ -17,27 +20,28 @@ const MachineComponent = ({ position, machine, onClick }) => {
         machine.cpuIds.length + machine.gpuIds.length + machine.memoryIds.length + machine.storageIds.length === 0
 
     return (
-        <li
-            className="d-flex list-group-item list-group-item-action justify-content-between align-items-center"
+        <ListGroupItem
+            action
+            className="d-flex justify-content-between align-items-center"
             onClick={onClick}
             style={{ backgroundColor: 'white' }}
         >
-            <span className="badge badge-default badge-info mr-1">{position}</span>
+            <Badge color="info" className="mr-1">
+                {position}
+            </Badge>
             <div className="d-inline-flex">
                 {machine.cpuIds.length > 0 ? <UnitIcon id="cpu" type="CPU" /> : undefined}
                 {machine.gpuIds.length > 0 ? <UnitIcon id="gpu" type="GPU" /> : undefined}
                 {machine.memoryIds.length > 0 ? <UnitIcon id="memory" type="memory" /> : undefined}
                 {machine.storageIds.length > 0 ? <UnitIcon id="storage" type="storage" /> : undefined}
-                {hasNoUnits ? (
-                    <span className="badge badge-default badge-warning">Machine with no units</span>
-                ) : undefined}
+                {hasNoUnits ? <Badge color="warning">Machine with no units</Badge> : undefined}
             </div>
-        </li>
+        </ListGroupItem>
     )
 }
 
 MachineComponent.propTypes = {
-    machine: Shapes.Machine,
+    machine: Machine,
 }
 
 export default MachineComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.js
index 12be26bd..1c07d237 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.js
@@ -1,11 +1,11 @@
 import React from 'react'
 import EmptySlotContainer from '../../../../../containers/app/sidebars/topology/rack/EmptySlotContainer'
 import MachineContainer from '../../../../../containers/app/sidebars/topology/rack/MachineContainer'
-import './MachineListComponent.sass'
+import { machineList } from './MachineListComponent.module.scss'
 
 const MachineListComponent = ({ machineIds }) => {
     return (
-        <ul className="list-group machine-list">
+        <ul className={`list-group ${machineList}`}>
             {machineIds.map((machineId, index) => {
                 if (machineId === null) {
                     return <EmptySlotContainer key={index} position={index + 1} />
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.module.scss b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.module.scss
new file mode 100644
index 00000000..f075aac9
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.module.scss
@@ -0,0 +1,3 @@
+.machineList li {
+    min-height: 64px;
+}
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.sass b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.sass
deleted file mode 100644
index 11b82c93..00000000
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/MachineListComponent.sass
+++ /dev/null
@@ -1,2 +0,0 @@
-.machine-list li
-    min-height: 64px
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackNameComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackNameComponent.js
deleted file mode 100644
index b701909a..00000000
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackNameComponent.js
+++ /dev/null
@@ -1,6 +0,0 @@
-import React from 'react'
-import NameComponent from '../NameComponent'
-
-const RackNameComponent = ({ rackName, onEdit }) => <NameComponent name={rackName} onEdit={onEdit} />
-
-export default RackNameComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.js
index ca41bf57..74313bf7 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.js
@@ -3,19 +3,19 @@ import BackToRoomContainer from '../../../../../containers/app/sidebars/topology
 import DeleteRackContainer from '../../../../../containers/app/sidebars/topology/rack/DeleteRackContainer'
 import MachineListContainer from '../../../../../containers/app/sidebars/topology/rack/MachineListContainer'
 import RackNameContainer from '../../../../../containers/app/sidebars/topology/rack/RackNameContainer'
-import './RackSidebarComponent.sass'
+import { sidebarContainer, sidebarHeaderContainer, machineListContainer } from './RackSidebarComponent.module.scss'
 import AddPrefabContainer from '../../../../../containers/app/sidebars/topology/rack/AddPrefabContainer'
 
 const RackSidebarComponent = () => {
     return (
-        <div className="rack-sidebar-container flex-column">
-            <div className="rack-sidebar-header-container">
+        <div className={`${sidebarContainer} flex-column`}>
+            <div className={sidebarHeaderContainer}>
                 <RackNameContainer />
                 <BackToRoomContainer />
                 <AddPrefabContainer />
                 <DeleteRackContainer />
             </div>
-            <div className="machine-list-container mt-2">
+            <div className={`${machineListContainer} mt-2`}>
                 <MachineListContainer />
             </div>
         </div>
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.module.scss b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.module.scss
new file mode 100644
index 00000000..8ce3836a
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.module.scss
@@ -0,0 +1,14 @@
+.sidebarContainer {
+    display: flex;
+    height: 100%;
+    max-height: 100%;
+}
+
+.sidebarHeaderContainer {
+    flex: 0;
+}
+
+.machineListContainer {
+    flex: 1;
+    overflow-y: scroll;
+}
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.sass b/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.sass
deleted file mode 100644
index 29fec02a..00000000
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/topology/rack/RackSidebarComponent.sass
+++ /dev/null
@@ -1,11 +0,0 @@
-.rack-sidebar-container
-    display: flex
-    height: 100%
-    max-height: 100%
-
-.rack-sidebar-header-container
-    flex: 0
-
-.machine-list-container
-    flex: 1
-    overflow-y: scroll