V3 app framework updates and misc.

[1000TurquoisePogs]

I went through all but the tutorials & samples section of the app framework docs and updated them for v3.

In doing so I also removed a few lines that sounded like "this feature has been available since version 1.xx..." because by now those features are so old that in the v3 doc we dont need the trivia of when it was introduced, the changelogs have that.

While reviewing the overall server docs I noticed content from other squads docs that was missing and added what I know.

[github-actions[bot]]

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