Use npmcdn in docs instead of rawgit for web player

Summary:
Switch web player cdn to npmcdn per discussion with lacker. This will make the url agnostic to who owns the git repo.
Closes https://github.com/facebook/react-native/pull/8426

Differential Revision: D3488755

Pulled By: lacker

fbshipit-source-id: b54dd4428a48c8a5a15b0b38ee0564d119916f9b

website/core/WebPlayer.js

@@ -57,7 +57,7 @@ var WebPlayer = React.createClass({
           style={{marginTop: 4}}
           width='880'
           height={this.parseParams(this.props.params).platform === 'android' ? '425' : '420'}
-          data-src={`//cdn.rawgit.com/dabbott/react-native-web-player/v0.1.3/index.html${hash}`}
+          data-src={`//npmcdn.com/react-native-web-player@1.0.0/index.html${hash}`}
           frameBorder='0'
         />
       </div>