feed brand landing (bug 1044176)

This is becoming more evident the more CSS work we do. The real solution is to change the markup/classes of much of the stuff in feed.styl. The core cause of this was a lack of mocks for desktop or the gradual introduction of mocks. It's a really good observation but the two pages have different markup and it's now a balancing game where layouts could clash quite a bit.

I will file a bug against myself to rework the markup/CSS of everything feed related since we now have an idea of the full UI picture.