Delete /xhprof/ from directory, mark /mail/ as Admin Only

Summary: /xhprof/ doesn't exist at all, /mail/ is only for admins

Test Plan: Display directory

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley, vrana

Differential Revision: https://secure.phabricator.com/D1405

resources/sql/patches/095.directory.sql

@@ -0,0 +1,6 @@
+UPDATE phabricator_directory.directory_item
+  SET name = 'MetaMTA (Admin Only)'
+  WHERE href = '/mail/';
+
+DELETE FROM phabricator_directory.directory_item
+  WHERE href = '/xhprof/';