Move people box on project pages
Summary: This removes the people box and adds a members property list item it's place. We may want some show/hide/see all if a project has more than n members, but these seems more reasonable than previous layout.
Test Plan: Tested a project with and without members, grepped for removed CSS, and tested mobile and desktop layouts.
Reviewers: epriestley
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Differential Revision: https://secure.phabricator.com/D7870