Fix #1288

Fix #9031
Fix #7913

* Add option to disable blurhash previews

* Update option text

* Change options order

* Add responsive panels to the single-column layout

* Fixes

* Fix not being able to save the preference

* Fix code style issues

* Set max-height on the compose textarea and add a link to relationship manager

* config: Add GITHUB_REPOSITORY for repository name

* config: Add SOURCE_BASE_URL for repository url

* Show source_url and repository name on getting started

* Allow to show a specific status in the admin interface

* Let the front-end know the current account is a moderator

* Add admin links to status and account menus

If the current logged-in user is an admin, add quick links to the admin
interface in account and toot dropdown menu. Suggestion by @ashkitten

* Use @statuses.first instead of @statuses[0]

Follow-up to #8766

Fix #7846

- Find friends from Twitter (bridge)
- Invite people (when invites enabled)
- Security (change e-mail/password)
- Developers (create OAuth apps/tokens)

* When advanced search is enabled, show different hint in search popout

* Change "getting started" icon in tabs bar from asterisk to hamburger

* Refactor initial state: "me"

* remove "me" from reducers/meta.js