Modernize phame and add concept of "blog style" to blog post list view

Summary:
"blog style" for now is just "true" to make this UI render better for the blog
LATER it will be a string which will choose the larger template. this will also have to do some messing around with links; when viewing on a phabricator instance links need to be a bit dirtier to carry around the blog whereas when viewing offsite we can tell what blog it is based on the host domain. anyhoo, this is future diff work

Test Plan: looked at blog - less ugly. resized blog to smaller sizes - became a "single list" of goodness for quality reading quite quickly.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3587