Remove some AphrontPanels

Summary: Removes AphrontPanelViews from UIExamples

Test Plan: Tested new layouts in each of the pages.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7427

Differential Revision: https://secure.phabricator.com/D11947