R1:9a076b71a3a6

Remove standalone huge single page setting edit controller

Summary: Ref T4103. This isn't necessary or particularly useful anymore since panels have been converted.

Test Plan: Visited URI, got a 404.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4103

Differential Revision: https://secure.phabricator.com/D16024