New Admin Welcome Screen

Summary: Somewhat easier to parse and present information, with ICONS.

Test Plan:
Rebuilt current view with new layout. Tested toggling on and off some of the entries.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11938