Move setup warning callout above the nav-drag div

Summary: See {T7830}

Test Plan: I manually set this to 5 in Chrome inspector and checked a few pages.

Reviewers: chad, #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12481