Add base colors as workboard color choices

Summary: Our base color pallette is good here as well. Updating CSS classes accordingly. We have 22 choices total now.

Test Plan:
Fake via dom inspector.

{F1111310}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15271