Summary:
The example uses StyleSheet.create and also arrays-of-styles. I think this covers everything the old one did, but in simple-enough-for-the-basics form, so I removed the old one. I also reordered so that "Style -> Dimensions -> Layout" is the flow for learning "Styley" things.
Closes https://github.com/facebook/react-native/pull/8379
Differential Revision: D3478384
Pulled By: caabernathy
fbshipit-source-id: 158f0f0367c8eb8b2b24feda0d8d7a533fd7af4d
e3f96acf26