R1:faa50c5d93c7

Use a "pinboard" UI to display image macros

Summary: Moves toward unblocking D3547. Use a pinboard/album view to show image macros. Modernize and make (mostly) responsive.

Test Plan: Will attach screenshots.

Reviewers: btrahan, vrana, chad, teisenbe

Reviewed By: vrana

CC: aran

Maniphest Tasks: T175

Differential Revision: https://secure.phabricator.com/D3576