R1:d0f477f17018

Clean up line-height on feed stories

Summary: Resets line-height, removes unused CSS.

Test Plan: Test long paragraphs in feed stories.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10828