message: Defer internal script
diff: </div>
  </footer>
  - <script src="{{ '/js/index.js' | url }}"></script>
  + <script defer async src="{{ '/js/index.js' | url }}"></script>
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script>
  <script type="text/javascript">
  docsearch({
  