index.html

<!DOCTYPE html>
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 Copyright 2019 Google LLC

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
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<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="refresh" content="0; url=demo/">
  </head>
  <body>
    You should be automatically redirected to the demo.
    If not, please <a href="demo/">click here</a>.
  </body>
</html>