Registration form: Client side validation + better display of server validation errors

See merge request pleroma/pleroma-fe!399

* remove email address validation, we have it covered by html itself and it's quite annoying
* add shakeError animation
* fix styles a bit

* also extract registration logic to users.js module

Hotfix for !388

See merge request pleroma/pleroma-fe!401

Switch to "timeline" when pressing user-settings

See merge request pleroma/pleroma-fe!397

Fix iOS Safari from making videos play fullscreen by default

Closes #178

See merge request pleroma/pleroma-fe!400

This works in iOS 10+.

used the deleted data param as condition in status template

Closes #81

See merge request pleroma/pleroma-fe!398

Made links in user bio always open in new tabs

Closes #169

See merge request !394

Added user setting tooltip

Closes #156

See merge request pleroma/pleroma-fe!395

added tooltip

See merge request pleroma/pleroma-fe!391

fixes vimium not giving retweet button a hint

Closes #166

See merge request pleroma/pleroma-fe!385

Added option to auto-hide subject field when it's empty.

Closes #174

See merge request pleroma/pleroma-fe!388

Server-side read marking

See merge request pleroma/pleroma-fe!386

User timeline improvements

Closes #186 and #120

See merge request pleroma/pleroma-fe!390

for another user

is_seen attribute