Improve page titles for menu items that render in-context content

Summary: Ref T12174. Dashboards and "Home" currently use the page title "Configure Menu". Give them more appropriate titles instead.

Test Plan: Viewed dashboards, Home. Saw relevant page titles.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12174

Differential Revision: https://secure.phabricator.com/D17281