R1:963025d3741c

Add "Blindigo" header color

Summary: Adds a new header color.

Test Plan:
Select new header color, see new header color.

{F326502}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11918