R1:ec8dbfd05f43

Dedupe DIRECTORY w/ Directory tab in directory header

Summary: the tab is a bit silly right next to DIRECTORY

Test Plan:
viewed phabricator with an admin account
* looks good on load
* clicked Categories and Items; looked good
viewed phabricator with a non-admin account
* looks good on load
* nothing else to click in the header

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: 1131