Release 0.9 Documentation

[wuchong]

Search before asking

• I searched in the issues and found nothing similar.

Description

This is an umbrella issue for tracking all 0.9 documentations.

Willingness to contribute

• I'm willing to submit a PR!

[wuchong]

@luoyuxia could you organize all 0.9 docuemntation under this umbrella issue? So that we can better track the progress of docs. Can be linked via "sub-issues" or "blocked-by".