Fix dead links in README.md and add note about new docs site

See merge request !1000

Improve PleromaJobQeue config documentation

See merge request !993

Replace Pleroma.Jobs with `pleroma_job_queue`

See merge request !992

Move out of Gitlab Wiki

See merge request pleroma/pleroma!990

Add automatic documentation build and deploy for master and develop branches

Closes #478

See merge request pleroma/pleroma!965

Revert awfully long migration from 568e3485

See merge request !991

I understand that this change is quite unreadable and hard to review, sorry for forgetting to do atomic commits. This patch does not change too much content wise, it just
* Gets everything from gitlab wiki
* Removes some specific gitlab hacks
* Formats all documentation file names to be in snake case so they look the same way as our code does

Admin API user show

Closes #766

See merge request pleroma/pleroma!987

Add more user filters + move search to its own module

See merge request pleroma/pleroma!982

Fix muting reblogs tests

See merge request !984

Fix missing announces in MastoAPI home timeline

Closes #762

See merge request pleroma/pleroma!983

Closes #762

MastodonAPI: Add GET /api/v1/apps/verify_credentials

See merge request !981

Do not federate instance avatar

Closes #759

See merge request pleroma/pleroma!977

Mastodon 2.7.2 instance attributes (registrations, languages)

See merge request !979

Mastodon-based auth error messages. User#auth_active?/1 refactoring.

See merge request !978

Increment replies_count (MastoAPI)

Closes #756

See merge request !974

Remove ActivityRepresenter

See merge request !980