removed index.html

When Parse receives a request for http://example.parseapp.com/path, we
will first check whether /path corresponds to a static file in your
public directory. If that file does not exist, then the request will hit
Cloud Code and invoke the Express request handler registered with the
'/path' route. If no request handler is registered, Express will render
a "404 Not Found" response. Cloud Code logs will only reflect the
requests that actually hit Cloud Code, not static files.