R1:65e964fca14d

Make "Core Applications" more reasonable

Summary: Ref T11132, cleaning up what "Core Applications" means.

Test Plan: Visit `/applications/`, see less poseurs.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11132

Differential Revision: https://secure.phabricator.com/D16394