Make the Backbone routes pushSTate capable with ?theme=themename type urls instead of hashes. Same applies to search queries.

Props adamsilverstein, nacin
fixes #25963

Built from https://develop.svn.wordpress.org/trunk@26767


git-svn-id: http://core.svn.wordpress.org/trunk@26655 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Making some adjustments to the hero screenshot image on the About page, see #26387.
Built from https://develop.svn.wordpress.org/trunk@26768


git-svn-id: http://core.svn.wordpress.org/trunk@26656 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Nudging a few pixels that were out of place. See #26387.


Built from https://develop.svn.wordpress.org/trunk@26769


git-svn-id: http://core.svn.wordpress.org/trunk@26657 1a063a9b-81f0-0310-95a4-ce76da25c4cd