Actor description/summary

See merge request funkwhale/funkwhale!1002

See #170: added content_category on artist

See merge request funkwhale/funkwhale!1001

See #170: record downloads count, expose subscribers count

See merge request funkwhale/funkwhale!1000

See #170: cover on tracks and artists

See merge request funkwhale/funkwhale!997

Resolve "Sort by album release date"

Closes #1013

See merge request funkwhale/funkwhale!998

See #170: added missing /api/v1/subscriptions endpoint

See merge request funkwhale/funkwhale!996

See #170: subscriptions API for channels

See merge request funkwhale/funkwhale!995

See #170: use new content obj for channel description

See merge request funkwhale/funkwhale!994

See #170: add a description field on tracks, albums, tracks

See merge request funkwhale/funkwhale!993

Resolve "long instance name overlapping next column in footer"

Closes #1012

See merge request funkwhale/funkwhale!992

Cache API/media files with service workers

See merge request funkwhale/funkwhale!991

Progressive web application

See merge request funkwhale/funkwhale!983

Set up player config for mobile control