Fix #777: Added a prune_library management command to remove obsolete metadata

Closes #777

See merge request funkwhale/funkwhale!698

Updated forum urls

See merge request funkwhale/funkwhale!697

Fix #776: Don't store unhandled ActivityPub messages in database

Closes #776

See merge request funkwhale/funkwhale!696

Fix #740: Do not consider tracks as duplicates during import if they have different positions

Closes #740

See merge request funkwhale/funkwhale!695

Fix #772: Prevent skipping on file import if album_mbid is different

Closes #772

See merge request funkwhale/funkwhale!694

Revert "Merge branch '769-ci-changes' into 'develop'"

See merge request funkwhale/funkwhale!691

This reverts merge request !689

Fix #769: run CI jobs only when relevant

Closes #769

See merge request funkwhale/funkwhale!689

Resolve "Implement a Oauth provider in Funkwhale"

Closes #752

See merge request funkwhale/funkwhale!672

Resolve "Show 'description' of libraries in card"

See merge request funkwhale/funkwhale!688

Fix #570: Exclude in-place imported files from quota computation

See merge request funkwhale/funkwhale!687

Updated mono-container documentation with compose file and NESTED_PROXY

See merge request funkwhale/funkwhale!686

Fix #766: Added title on hover for truncated content

See merge request funkwhale/funkwhale!685

Fix #767: broken Activity and Actor modules in django admin

See merge request funkwhale/funkwhale!684

Fix #764: broken sample apache configuration

See merge request funkwhale/funkwhale!683

Fix #757: Ensure cover art from uploaded files is picked up properly on existing albums

See merge request funkwhale/funkwhale!682

Fix #765: Include disc number in Subsonic responses

See merge request funkwhale/funkwhale!681