docs: points towards the website

The website is now much more stable, so there's no need to keep two
copies of the same content (which must be manually kept in sync).

README.md

@@ -10,43 +10,11 @@
 
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/socket.svg)](https://saucelabs.com/u/socket)
 
-## How to use
+## Documentation
 
-A standalone build of `socket.io-client` is exposed automatically by the
-socket.io server as `/socket.io/socket.io.js`. Alternatively you can
-serve the file `socket.io.js` found in the `dist` folder or include it via [CDN](https://cdn.jsdelivr.net/npm/socket.io-client@2/dist/socket.io.js).
+Please see the documentation [here](https://socket.io/docs/v3/client-initialization/).
 
-```html
-<script src="/socket.io/socket.io.js"></script>
-<script>
-  var socket = io();
-  socket.on('connect', function(){});
-  socket.on('event', function(data){});
-  socket.on('disconnect', function(){});
-</script>
-```
-
-```js
-// with ES6 import
-import io from 'socket.io-client';
-
-const socket = io();
-```
-
-A slim build (without [debug](https://github.com/visionmedia/debug)) is also available: `socket.io.slim.js`.
-
-Socket.IO is compatible with [browserify](http://browserify.org/) and [webpack](https://webpack.js.org/) (see example [there](https://github.com/socketio/socket.io/tree/2.0.3/examples/webpack-build)).
-
-### Node.JS (server-side usage)
-
-  Add `socket.io-client` to your `package.json` and then:
-
-  ```js
-  var socket = require('socket.io-client')('http://localhost:3000');
-  socket.on('connect', function(){});
-  socket.on('event', function(data){});
-  socket.on('disconnect', function(){});
-  ```
+The source code of the website can be found [here](https://github.com/socketio/socket.io-website). Contributions are welcome!
 
 ## Debug / logging
 
@@ -56,11 +24,7 @@ In order to see all the client debug output, run the following command on the br
 localStorage.debug = '*';
 ```
 
-And then, filter by the scopes you're interested in. See also: https://socket.io/docs/logging-and-debugging/
-
-## API
-
-See [API](/docs/API.md)
+And then, filter by the scopes you're interested in. See also: https://socket.io/docs/v3/logging-and-debugging/
 
 ## License