Resolve "Changes to CSS have broken Dark Theme"

Closes #916

See merge request funkwhale/funkwhale!888

Reduced CSS size by 30% using purgecss

See merge request funkwhale/funkwhale!887

See #890: Documentation and release notes

Closes #890

See merge request funkwhale/funkwhale!886

Review fixes for report notifications not included in !880

See merge request !885

See #890: web UI and email notifications on new reports

See merge request !880

See #890: display number of report and link to associated reports on account, artist, album, track and library moderation page

See merge request funkwhale/funkwhale!883

See #890: expose number of reports linked to tracks, albums, libraries, accounts and artists via the /stats route

Fixed broken external HTTPS request under some scenarios, because of missing PyOpenSSL

See merge request funkwhale/funkwhale!884

Ensure selected locale is not reset to browser default when refreshing app

See merge request funkwhale/funkwhale!879

Playlist embed

See merge request funkwhale/funkwhale!878

See #890: minor improvements to report UI

See merge request funkwhale/funkwhale!876

See #890: admin UI for reports settings

See merge request funkwhale/funkwhale!873

Improvement of Apache config consistency and ease of configuration

See merge request funkwhale/funkwhale!874

Report UI (end-user)

See merge request funkwhale/funkwhale!872

Resolve "Missing license information on track details page"

Closes #913

See merge request funkwhale/funkwhale!875

moderator interface for reports (#890)

See merge request funkwhale/funkwhale!866

Resolve "Typo in settings"

Closes #911

See merge request funkwhale/funkwhale!871

Resolve "Wrong title for track ellipsis"

Closes #899

See merge request funkwhale/funkwhale!870