Move a bunch of status-related styles from App to status component, alter status header layout for better user experience hopefully, make status actions placing more consistent, adjust margins.

Feature/notification improvements

See merge request !79

Add a custom timeago.json for shorter timestamps, for example '15s' instead of '15 seconds ago'

See merge request !80

Make post-status-form textarea automatically resize to fit the input.

See merge request !81

Merge branch 'develop' of ssh.gitgud.io:lambadalambda/pleroma-fe into feature/notification-improvements

Enable reply/rt/fav for mention notifications by using a barebones status in place of plain notification content.

Alternative autocompletion is in the works and this one has injection problems.

Polish up post-status form

See merge request !78

Fix the floating 'remove attachment' icon on post status form.

See merge request !77

Fix / add explicit lang="en" to html

See merge request !75

Reply navigation fix for opening conversations in new tab

See merge request !74

Sidepanel independent scrolling

See merge request !72

Change attachments margin to not cause the element to overflow.

See merge request !73