Since docs are now generated alongside builds and hosted on the app server there is no longer a barrier to using docusaurus docs as the main documentation presentation. Any user looking for docs can use the GH Pages hosted site or a "versioned" docs site hosted on their MS app. Due to this we can fully commit to docusaurus and take advantage of MDX layouts to simplify docs.
* Replace env/file configs headings in configuration with MDX tabs to make reading easier
* Remove superfluous TOCs
* Replace internal links in repo readme with links to docsite
* setup.sh takes care of building generated sources for project/docsite and building flatpak app
* Modify flatpak manifest to include two generated sources files and build docsite files
* Update flatpak docs with script usage and generated sources changes, move to docusauraus doc site
