Show PhamePost and PhameBlog content/descriptions on detail pages

Summary: Currently the new detail pages don't show this information. Show it, and use the remarkup cache for BLAZING OODLES OF PERFOARMSNECES!!~~~

Test Plan: See screenshots.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3700