Fix #2350

* RTL: fix admin account avatar margin in about page

* fix code style

* Fix position of the domain label

* Fix position of the domain label for RTL

- Fix color mismatch of linear gradient which assigned to "::after" pseudo class

* Add conversations API

* Add web UI for conversations

* Add test for conversations API

* Add tests for ConversationAccount

* Improve web UI

* Rename ConversationAccount to AccountConversation

* Remove conversations on block and mute

* Change last_status_id to be a denormalization of status_ids

* Add optimistic locking

* RTL: fix margins of public-account-header__tabs

* fix style

* even more stylish code :)

* RTL: fix margins: public-layout.header.nav-button

* add empty line to meet style guides

* Revert "Fix some icon names changed by the Font Awesome 5. (#8796)"

This reverts commit 3f9ec3de82.

* Revert "Migrate to font-awesome 5.0. (#8799)"

This reverts commit 8bae14591b.

* Revert "Fix some icons names, unavailable in fontawesome5 (free license). (#8792)"

This reverts commit b9c727a945.

* Revert "Update the icon name changed by the Font Awesome 5. (#8776)"

This reverts commit 17af4d27da.

* Revert "Add bot icon to bot avatars and migrate to newer version of Font Awesome (#8484)"

This reverts commit 4b794e134d.

Show "read more" link on overly long in-stream statuses

* Migrate to newer version of Font Awesome

* Add bot icon to bot avatars

* RTL: fix statubar action buttons/counter margins

* remove trailing whitespaces

This will allow easier customization of font family instead of going
through all occurrences of 'mastodon-font-sans-serif'.

* 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

* NavLinks with activeclass instead of Link in actionbar to highlight active tab

* highlight border-bottom in action bar consistent to public view

You currently need to enable `layout.css.scrollbar-colors.enabled` in `about:config` in Firefox
Nightly.

Fix #3894

* Add confirmation page for suspensions

* Suspension confirmation closes reports, linked from report UI

* Fix tests

* reorder simple form ul to list vertically (fixes #8236)

* remove browser specific prefixes

* Make dropdown animations respect their placement

Also fix the corner radius on the privacy dropdown button when using top placement

* Fix code style issue

Fix #8284

* 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

* Disable the animated rainbow text when the “Reduce motion” setting is set

* Get rid of the Content Warning rainbows

* Revert to default color for CWs in admin view

Since that colorscheme is apparently broken for some colorblind people.

* Use HTML5's details and summary for statuses with CWs in admin interface

Follow-up to #8142

* Compensate for scrollbar disappearing when media modal visible

Make auth pages backgrounds lighter

* Fix typo