for MediaProxyWarmingPolicy in ConcurrentLimiter

Pleroma.Web.RichMedia.Helpers & Pleroma.Web.MediaProxy

The version of Oban we depend on no longer uses ShareLocks, so this
note no longer applies.

- start oban in mix tasks with empty queues, plugins and crontab
- fix for update_users_following_followers_counts
- fix for removed logo.png
- typo in resend confirmation emails mix task docs
- fix for uploads mix task (start Majic.Pool)
- fix for creating user mix task (start :fast_html app)

Current FedSocket implementation has a bunch of problems. It doesn't
have proper error handling (in case of an error the server just doesn't
respond until the connection is closed, while the client doesn't match
any error messages and just assumes there has been an error after 15s)
and the code is full of bad descisions (see: fetch registry which uses
uuids for no reason and waits for a response by recursively querying a
 ets table until the value changes, or double JSON encoding).

Sometime ago I almost completed rewriting fedsockets from scrach to
adress these issues. However, while doing so, I realized that fedsockets
 are just too overkill for what they were trying to accomplish, which is
 reduce the overhead of federation by not signing every message.
This could be done without reimplementing failure states and endpoint
 logic we already have with HTTP by, for example, using TLS cert auth,
or switching to a more performant signature algorithm. I opened
https://git.pleroma.social/pleroma/pleroma/-/issues/2262 for further
discussion on alternatives to fedsockets.

From discussions I had with other Pleroma developers it seems like they
 would approve the descision to remove them as well,
therefore I am submitting this patch.

- revert UserAllowPolicy description
- MRF descriptions order

[#1668] App metrics endpoint (Prometheus) access restrictions

Closes #1668

See merge request pleroma/pleroma!3093

In practice, it was already removed half a year ago, but the description
 and cheatsheet entries were still there.

The migration intentionally does not use ConfigDB.get_by_params, since
this will break migration code as soon as we add a new field is added
 to ConfigDB.

Closes #2086

changed namespace for activity expiration configuration

This reverts commit 7215563641.

Rich media improvements

See merge request pleroma/pleroma!2944

not needed options deletion

Use a separate pool for preview requests