redis-backed "mentions" timeline as redundant (given notifications)

Changing the way the background image is positioned and the box is sized should fix problems with the text overlapping the image on mobile browsers and Edge.

Make profile header scroll along with contents. AccountTimeline, Followers and Following are no longer
nested inside a common parent (<Account>), instead they all embed <HeaderContainer />

the public timeline has been using

Currently we have the problem where the follow request button is missing
from the Follow request tab. This means that when you visit that tab you
either have to press the back button in the browser or re-enter the home
page, which breaks the app flow.

This will resolve that issue by adding a new back button to that tab,
in the same way that the public timeline, and favourites have.

Do not automatically login after password reset, as it would circumvent two-factor auth (if enabled)
Do not require e-mail address changes to be re-confirmed, it's only trouble for no real benefit

fix button outline showing on clicks for prettiness

remove button outlines on-click for retweet, boost, favourite, and reply
buttons

fix ProcessFeedService pushing status into distribution if called a second time
while the first is still running (i.e. when a PuSH comes after a Salmon slap),
fix not running escape on spoiler text before emojify