Autogenerate documentation on GitHub Release

[keeshux]

On pushed tag (bump script, currently NOT WORKING):

• Autogenerate and publish DocC documentation in CI
  • https://apple.github.io/swift-docc-plugin/documentation/swiftdoccplugin/
  • https://apple.github.io/swift-docc-plugin/documentation/swiftdoccplugin/publishing-to-github-pages
• Publish to GitHub Pages:
  • https://partout.io/docs
  • Check missing entities in index
  • Embed in framework
  • Look for neat Jekyll theme for docs website
• Fix unsorted sidebar (content view is sorted)