This change updates the repository with a new Docusaurus-based
documentation website. This allows us to create our documentation using
Markdown, MDX and React. This will serve as the main entry point for
users visiting https://opendc.org. The actual OpenDC application will be
moved to https://app.opendc.org.

This change updates the deployment guide based on the latest changes to
the Quarkus application. Quite a few existing configuration options can
be removed now.

This change updates the document outlining the architecture of OpenDC,
which does not use a Python-based web API anymore.

This change updates the deployment guide for the recent change of the
simulator runner which now communicates via the API instead of directly
with the Mongo database.

See 6752b6d50faab447b3edc13bddf14f53401392f1 for more information.

This change updates the Gradle configuration to target Java 11 (instead
of Java 8) as the lowest denominator when building OpenDC. Since the
project has not yet been adopted by (many) other applications, we should
not restrict the project to such an old Java version.

This change updates the deployment guide to include instructions on
configuring Auth0 for OpenDC. This process should not be much more
difficult than creating the Google Application.

This change fixes the invalid reference to the image of the OpenDC
component overview.