R1:5bdc7dd07b6c

Minor style updates to Phame

Summary: More obvious crumbs, remove border on images, better image spacing.

Test Plan: Build out a test blog, click on crumbs, view spacing.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17101