[Redesign] Anchor blue
Summary: Use a consistent blue across all anchors. Slightly lighter than current blue. Ref T8099
Test Plan: Visit Phriction, Remarkup, various apps.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T8099
Differential Revision: https://secure.phabricator.com/D12918