R1:397bef68d7d7

[Redesign] Darken logo

Summary: Ref T8099, Just darkens the logo to {$darkbluetext}.

Test Plan: Reload, see new logo

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D12911