merge: Add documentation using Docusaurus (#97)

This pull request implements the new OpenDC documentation website using Docusaurus 2.

## Implementation Notes :hammer_and_pick:

* Add initial Docusaurus website.
* Migrate existing docs to Docusaurus.
* Configure Prettier for Docusaurus.
* Add tutorials to OpenDC website (#28)
* Add deployment workflow via GitHub actions

## External Dependencies :four_leaf_clover:

* Docusaurus 2

Closes #28

1 files changed, 84 insertions, 0 deletions

diff --git a/site/docs/advanced-guides/deploy.md b/site/docs/advanced-guides/deploy.md
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+---
+sidebar_position: 3
+---
+
+# Deploying OpenDC
+This document explains how you can deploy a multi-tenant instance of OpenDC using Docker.
+
+## Contents
+
+1. [Setting up Auth0](#setting-up-auth0)
+1. [Installing Docker](#installing-docker)
+1. [Running OpenDC from source](#running-opendc-from-source)
+
+## Setting up Auth0
+
+OpenDC uses [Auth0](https://auth0.com) as Identity Provider so that OpenDC does not have to manage user data itself,
+which greatly simplifies our frontend and backend implementation. We have chosen to use Auth0 as it is a well-known
+Identity Provider with good software support and a free tier for users to experiment with.
+
+To deploy OpenDC yourself, you need to have an [Auth0 tenant](https://auth0.com/docs/get-started/learn-the-basics) and
+create:
+
+1. **An API**  
+   You need to define the OpenDC API server in Auth0. Please refer to the [following guide](https://auth0.com/docs/quickstart/backend/python/01-authorization#create-an-api)
+   on how to define an API in Auth0.
+
+   Remember the identifier you created the API with, as we need it in the next steps (as `OPENDC_AUTH0_AUDIENCE`).
+2. **A Single Page Application (SPA)**  
+   You need to define the OpenDC frontend application in Auth0. Please see the [following guide](https://auth0.com/docs/quickstart/spa/react#configure-auth0)
+   on how you can define an SPA in Auth0. Make sure you have added the necessary URLs to the _Allowed Callback URLs_:
+   for a local deployment, you should add at least `http://localhost:3000, http://localhost:8080`.
+
+   Once your application has been created, you should have a _Domain_ and _Client ID_ which we need to pass to the
+   frontend application (as `OPENDC_AUTH0_DOMAIN` and `OPENDC_AUTH0_CLIENT_ID` respectively).
+
+
+## Installing Docker
+
+OpenDC uses [Docker](https://www.docker.com/) and [Docker Compose](https://docs.docker.com/compose/) to orchestrate the
+deployment of the software stack. Please refer to [Docker Desktop](https://www.docker.com/products/docker-desktop) for
+instructions on how install Docker on your machine.
+
+## Running OpenDC from source
+
+To build and run the full OpenDC stack locally on Linux or Mac, you first need to clone the project:
+
+```bash
+git clone https://github.com/atlarge-research/opendc.git
+
+# Enter the directory
+cd opendc/
+```
+
+In the directory you just entered, you need to set up a set of environment variables. To do this, create a file
+called `.env` in the `opendc` folder. In this file, replace `your-auth0-*` with the Auth0 details you got from the first
+step. For a standard setup, you can leave the other settings as-is.
+
+```.env
+OPENDC_DB_USERNAME=opendc
+OPENDC_DB_PASSWORD=opendcpassword
+OPENDC_AUTH0_DOMAIN=your-auth0-domain
+OPENDC_AUTH0_CLIENT_ID=your-auth0-client-id
+OPENDC_AUTH0_AUDIENCE=your-auth0-api-identifier
+OPENDC_API_BASE_URL=http://web
+```
+
+We provide a set of default traces for you to experiment with. If you want to add others, place them in the `traces`
+directory and add entries to the database (see also [the SQL init script](https://github.com/atlarge-research/opendc/tree/master/opendc-web/opendc-web-server/src/main/resources/db/migration/V1.0.0__core.sql))
+
+If you plan to deploy publicly, please also tweak the other settings. In that case, also check the `docker-compose.yml`
+and `docker-compose.prod.yml` for further instructions.
+
+Now, start the server:
+
+```bash
+# Build the Docker image
+docker-compose build
+
+# Start the containers
+docker-compose up
+```
+
+Wait a few seconds and open `http://localhost:8080` in your browser to use OpenDC. We recommend Google Chrome for the
+best user experience.