docs(README): remove beta && change website URL

README.md

@@ -6,26 +6,19 @@
 
 InstantSearch projects: **Angular InstantSearch** | [React InstantSearch][react-instantsearch-github] | [InstantSearch.js][instantsearch.js-github] | [InstantSearch Android][instantsearch-android-github] | [InstantSearch iOS][instantsearch-ios-github].
 
-## Beta feedback
-
-This project is currently in **beta**, we welcome any feedback via [GitHub issues](https://github.com/algolia/react-instantsearch/issues/new) and there's also a dedicated chat available at [gitter.im/angular-instantsearch](https://gitter.im/angular-instantsearch).
-
-During the beta, we will do substantial changes based on your feedback. For all of those changes, we will warn
-every users via our chat, discourse and GitHub releases.
-
 ## Angular compatibility
 
 Angular InstantSearch is **compatible with Angular 4 and 5**. If you need a different version of Angular, please [open an issue](https://github.com/algolia/react-instantsearch/issues/new) or come [chat with us](https://gitter.im/angular-instantsearch).
 
 ## Documentation
 
-There's a dedicated documentation available at <https://algolia.gitbooks.io/angular-instantsearch/>.
+There's a dedicated documentation available at <https://community.algolia.com/angular-instantsearch/>.
 
 ## Contributing
 
 To contribute to the library (code and documentation), [read our contribution guide](./CONTRIBUTING.md).
 
-[website]: https://algolia.gitbooks.io/angular-instantsearch/
+[website]: https://community.algolia.com/angular-instantsearch/
 [algolia-website]: https://www.algolia.com/
 [instantsearch.js-github]: https://github.com/algolia/instantsearch.js
 [react-instantsearch-github]: https://github.com/algolia/react-instantsearch