Deprecate the repo, since React is now officially maintained by dash!

Author: chenglou

README.md

@@ -1,5 +1,11 @@
 # [React](http://facebook.github.io/react/) Dash Documentation
 
+**React is now officially maintained by Dash**. There's no need for this library anymore. Thus, it's now deprecated!
+
+Below is the old instruction.
+
+===
+
 **If you're looking for React documentations for Dash**: they're already in Preferences -> Downloads -> User Contributed. This repo is used to generate those docs. You don't need to touch it unless you want to contribute to it.
 
 To update the docset, please read the instructions [here](https://github.com/Kapeli/Dash-User-Contributions#contribute-a-new-docset) (more specifically, "Set up your directory structure"). To generate the docset for your Dash-User-Contributions pull quest, you'd use this repo.