Add AuthorHref to feed story images
Summary: Fixes T9336. Kind of a bit to back up and find the source, but works easily.
Test Plan: View feed, click on my image.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Maniphest Tasks: T9336
Differential Revision: https://secure.phabricator.com/D17322