* Improve OpenGraph tags for about pages

* Add thumbnail admin setting

* Fix error

* Fix up

- Return all images as og:image
- Return videos as og:image (preview) and og:video
- Return profile:username on profiles

* Add Mastodon::Source.url

* Update spec

* Refactor

Move things frmo Mastodon::Source to Mastodon::Version

glitch-soc's about page grabs said value from InstancePresenter; the
double needs to emulate that.

* Redesign /terms page

* Fix tests

* Remove unused keys

* Redesign the landing page, mount public timeline on it

* Adjust the standalone mounted component to the lacking of router

* Adjust auth layout pages to new design

* Fix tests

* Standalone public timeline polling every 5 seconds

* Remove now obsolete translations

* Add responsive design for new landing page

* Address reviews

* Add floating clouds behind frontpage form

* Use access token from public page when available

* Fix mentions and hashtags links, cursor on status content in standalone mode

* Add footer link to source code

* Fix errors on pages that don't embed the component, use classnames

* Fix tests

* Change anonymous autoPlayGif default to false

* When gif autoplay is disabled, hover to play

* Add option to hide the timeline preview

* Slightly improve alt layout

* Add elephant friend to new frontpage

* Display "back to mastodon" in place of "login" when logged in on frontpage

* Change polling time to 3s

* Update rails to version 5.0.3

* Update aws-sdk to version 2.9.17

* Update capistrano to version 3.8.1

* Update climate_control to version 0.2.0

* Update debug_inspector to version 0.0.3

* Update et-orbi to version 1.0.4

* Update oj to version 3.0.7

* Update microformats2 to version 2.9.0

* Update lograge to version 0.5.1

* Clean up usage of Microformats2 object to remove deprecation warnings

* Update microformats2 to version 3.0.1

* Remove react-rails gem

* Fix broken view spec

* add og:url to stream_item view

* add og:url and text to about/show

* add og:url to profile, followers and follows pages

Create MediaAttachment but without actual file download when domain is blocked with reject_media set to true
Clean up old media files when creating a new domain block with reject_media set to true
Return remote_url in media attachments API if local file is not present
Undo domain block action in admin UI
Ability to enable reject_media from admin UI

* Add option to disable verify partial doubles

* Add show_landing_strip? helper method

* Use show_landing_strip? helper in accounts and stream entries views

* Fix naming in view specs

* Correct site_contact_email typo

* Separate about more page into partials, add specs

as suggested, moving to view tests rather than a controller test
replaces https://github.com/tootsuite/mastodon/pull/1786 which i will
close momentary