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.
- [x] Sped up the demo animations 2x
Lowercase D? <em>Demos</em> isn't a proper noun and we use lower-case for secondary words in other placeholder text.