Deprecate package

[sapegin]

React Styleguidist supports create-react-app out of the box since 5.0, so there’s no need for extra package anymore.

🐙

[just-boris]

That's true.
Updated the readme, also added a deprecation warning to npm install.
Hope it will be enough!

Thank you for the effort bringing this into core!

[sapegin]

Awesome, thanks! I’ve also sent a new PR to CRA: facebook/create-react-app#2044