Render Remarkup poorly in Phame Feed stories

Summary: Seeing if this is the correct path, then will apply in Pholio, Ponder.

Test Plan: epriestley

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: joshuaspence, Korvin

Maniphest Tasks: T9825

Differential Revision: https://secure.phabricator.com/D14646