Summary: This moves aphront-side-nav to use same table css display as profile nav. Slightly less code to support. Cleans up AppSearch UI, think I've gotten all the edge cases here, but bang on it, can hold until after release cut.
Test Plan: Config, Maniphest, Differential, Diffusion, Home.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D16346
