I'll fill this out more, but I started on some clean up here and it turned into a lot of moving around content and deleting content.

Briefly, some of the changes are:

• Frame our integration documentaiton as project integration, not global "this is how you connect your account to Read the Docs". There is user guides for connecting accounts that is separate
• Add actual content for other integrations, especially GHA
• Break out troubleshooting content page that is basically a more informative version of our repo repair UI