title: how to add title icon (favicon) in amp-html
body: <p>I am trying these for adding title bar icon in amp project</p>
  
  <pre><code>&lt;link href="/theme/images/favicon.png" rel="shortcut icon" type="image/png" /&gt;
  </code></pre>
  
  <p>OR</p>
  
  <pre><code>&lt;link rel="icon" href="/theme/images/favicon.png"&gt;
  </code></pre>