Fix #6856
Fix #6951

* Do not animate account header art if user's GIF autoplay setting is off

Fixes #9472

* Honour currently logged-in user's GIF autoplay setting for account avatars

Fixes #9467

* Fix avatar display on some public pages when data is stored on a different host

* Use ternary operator instead of if/else for avatar/header URL

* Verify link ownership with rel="me"

* Add explanation about verification to UI

* Perform link verifications

* Add click-to-copy widget for verification HTML

* Redesign edit profile page

* Redesign forms

* Improve responsive design of settings pages

* Restore landing page sign-up form

* Fix typo

* Support <link> tags, add spec

* Fix links not being verified on first discovery and passive updates

* Group reports by target account

* Improve CSS

* Add remote interaction dialog for toots

* Change AuthorizeFollow into AuthorizeInteraction, support statuses

* Update brakeman.ignore

* Adjust how interaction buttons are display on public pages

* Fix tests

This prevents the bug where if you go "back" to the UI after navigating to
another page it loads with the old set of statuses