More Ponder Answer polish

Summary: Fixes T9099, I think this is as much as I can come up with for unbeta. Cleans up the answer header (profile image, smaller font, smaller header). Cleans up voting (new, with color), and makes it a bit more readable.

Test Plan:
Review a number of answers in ponder with and without votes, comments.

{F720189}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9099

Differential Revision: https://secure.phabricator.com/D13907