bug 1087015 - Improvements to demo studio for smaller header, search pla...

Improvements thus far include:

- [] Search box no longer displays on small screens; a search icon will instead appear and clicking it will then display the search form
- [] Outlines will no longer appear as you click + scroll through demo studio features
- [] The search placeholder on the main page is now "Search Demos" so as not to be confused with the header search.