Fix #904: Fixed a responsive display issues on 1024px wide screens

Closes #904

See merge request !890

Resolve "Search playlist unexpectedly triggers keyboard sortcut commands"

Closes #902

See merge request !891

Fix issue with search transition being purged

See merge request !892

Resolve "Broken 'Less listened' Radio in develop version"

Closes #912

See merge request !889

Resolve "Changes to CSS have broken Dark Theme"

Closes #916

See merge request !888

Reduced CSS size by 30% using purgecss

See merge request !887

See #890: Documentation and release notes

Closes #890

See merge request !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 !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 !884

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

See merge request !879

Playlist embed

See merge request !878

See #890: minor improvements to report UI

See merge request !876

See #890: admin UI for reports settings

See merge request !873

Improvement of Apache config consistency and ease of configuration

See merge request !874

Report UI (end-user)

See merge request !872

Resolve "Missing license information on track details page"

Closes #913

See merge request !875