R1:a7ce55e3caf3

Remove extra side navs in Herald

Summary: Ref T2769. Removes some nonstandard side navs.

Test Plan: Viewed affected pages.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2769

Differential Revision: https://secure.phabricator.com/D6651