Created a preference pane for DarkConsole, instead of link
Summary: Just removed the link and created a new field under preferences. Now the setting is under Display Preferences.
Test Plan: Enablied/Disabled dark console to see if it works.
Reviewers: epriestley
Reviewed By: epriestley
CC: irinav, aran, Korvin
Maniphest Tasks: T2344
Differential Revision: https://secure.phabricator.com/D4549
Conflicts:
src/view/page/PhabricatorStandardPageView.php