Typedoc: Update website plugin list

[Gerrit0]

https://typedoc.org/guides/plugins/ lists a few TypeDoc plugins. There doesn't seem to be much rhyme or reason for how these were chosen, and some of them appear abandoned and don't work on the latest version of TypeDoc.

• [ ] Create GitHub action to automatically generate plugin list
• [ ] Make --plugin link to https://typedoc.org/guides/options/#plugin

[Gerrit0]

A couple of plugins to add that were mentioned in Gitter:

• UML class generation by @krisztianb - https://github.com/krisztianb/typedoc-umlclass
• Specify a favicon + include generation time in the footer by @Drarig29 - https://www.npmjs.com/package/typedoc-plugin-extras

[krisztianb]

I'd like to propose another useful plugin for the list: https://github.com/artifacthealth/typedoc-plantuml

[Gerrit0]

This one too https://github.com/mipatterson/typedoc-plugin-pages

[Gerrit0]

The plantuml plugin above has been abandoned, I think I'll just list https://github.com/krisztianb/typedoc-umlclass since it's still maintained.

[Gerrit0]

Reworked this a bit - it should be possible to use GitHub actions to query npm for a plugin list, then the site can just display plugins with a release in the last 3? 6? months

Edit: or even better, check the package.json metadata to see what versions they claim to be compatible with, and only display if compatible with the current TD version!