Completely remove Pholio right gutter

Summary:

• Moves the right-hand gutter under the image.
• Moves size information to the upper right.
• This is transitional, on the way toward something more like the mocks in D9534.

Test Plan: See screenshot.

Reviewers: chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D9538