Fix XHProf index page

Summary:
Ref T2870. This resolves a few issues:

• No proper Application. Define one.
• Routes are in the default controller. Move them to the application.
• UI doesn't work on mobile.
• Overescaping in the link column.

Test Plan:
Old page:

{F38444}

New page:

{F38445}

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran, AnhNhan, edward

Maniphest Tasks: T2870

Differential Revision: https://secure.phabricator.com/D5531