Update README.md

Author: gaearon

README.md

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 Create React apps with no build configuration.
 
 - [Creating an App](#creating-an-app) – How to create a new app.
-- [User Guide](https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md) – How to develop apps bootstrapped with Create React App.
+- [User Guide](https://facebook.github.io/create-react-app/docs/folder-structure) – How to develop apps bootstrapped with Create React App.
 
 Create React App works on macOS, Windows, and Linux.<br>
 If something doesn’t work, please [file an issue](https://github.com/facebook/create-react-app/issues/new).