[Redesign] Spaces header colors
Summary: Ref T8099, Gives some additional prominence to a Space (darkred) in headers and obj lists.
Test Plan: Test a sample space. Some concern on workboards if space name is long.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T8099
Differential Revision: https://secure.phabricator.com/D13312