Remove SSH/BBS feature from core

Merged Duponin requested to merge Duponin/pleroma:duponin/remove-ssh into develop

After spending time creating Sshocial as a replacement for Pleroma's SSH/BBS feature, I remove this feature from Pleroma's core.

I've removed traces of SSH/BBS from:

  • lib
  • tests
  • documentation tells it's removed and points to Sshocial
  • translations (which is not updated btw)
  • mix.exs and mix.lock
  • no longer in supervision tree

I tried my best going throughout all the repo, but I may have missed references not under the name "ssh" or "bbs".

Closes #932 (closed) #2389 (closed) #2931 (closed)
Moves forward #2879

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