fixup! extra/demo-stb: Add stb-tester.com logo / DOG
extra/demo-stb: (in progress) "Home" menu with double carousel of content

Doesn't actually support navigating the carousel, or playing the
content, yet.
extra/demo-stb: Content for Elephants Dream

(Not actually playable yet from the home screen.)
extra/demo-stb: Home page: Smaller thumbnails

To make room for a future Search input at the bottom.

The plan is that you start typing and it will filter results on the fly.