R1:c2b31149ab3d

Removie panelview backgrounds from Herald.

Summary: Prior to re-doing responsive form CSS, update the Herald app for no panel backgrounds.

Test Plan: Went through Herald application, see no panels.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4545