Convert Drydock to two column layout

Summary: Updates Drydock to use two column + curtain layouts.

Test Plan: Tested what I could get to, need @epriestley to run this locally for edge cases.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D15467