CSS to replace jquery.animate

[novaugust]

Description

The Posts content list and Settings menu are two screens that work identically on mobile phones, allowing users to go back and forth between a list/menu and a content screen.

Right now, that going back and forth is powered by jQuery's animate method. It would be beyond wonderful if we could tear that out in favor of just toggling some class.

This would be a part of #3922, and is also relevant to the removal of jQuery from the postscontroller (#3950)

Code Locations

The suspect code is here on the posts controller, and here on the settings views

[novaugust]

Sorry @PaulAdamDavis, better to ping you than to assign you =) Would always be wonderful to get some other folks to start writing sass :D

[novaugust]

Closing in favor of #3584

[novaugust]

Reopening as 3584 is headed in a slightly different direction of abstraction vs straight cleanup