Use PHUIPinboard UI for embedding Pholio Mocks
Summary: Changes the old dark embed to match the PinboardView. Retains ability to target individual files. Removes "carousel" of files (not super useful?)
Test Plan:
Tested embedding Mocks, with and without targeting specific files. Tested Pholio Pinboard, Macro Pinboard.
{F166451}
{F166452}
{F166453}
{F166454}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9531