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

Merge branch 'develop' of ssh.gitgud.io:lambadalambda/pleroma-fe into feature/sidepanel-independent-scrolling

Make sidepanel scroll independently from timeline, allows for seeing notifications and posting new statuses even when scrolled deep down.

New default dark/light themes

See merge request !71

Potential new default dark and light themes added (base16-pleroma-dark, base16-pleroma-light). The new dark one set as the default.

Reply navigation (up only)

See merge request !70

Goto-original-arrow button now sets conversation highlight/focus even when inline, setting focus now scrolls you to the focused post smoothly. Hide the arrow button when not expanded.

Fix daily average on accounts younger than a day

See merge request !69

Feature/filtering

See merge request !68

Fix/attachment sizing

See merge request !67