Revamp Profile with new IconNav

Summary: Revamps Profile to be like Projects, a mini portal and side nav with icons.

Test Plan: Viewed my own profile, as well as others. Test seeing my commits, tasks, diffs, and upcoming events. Checked mobile navigation.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11547