message: docs(api): prevent redirect loop for invalid doc URLs
  changed relative redirect URL to absolute to fix infinite loop. also put v2 docs to top of list shown if redirect is blocked.
diff: <script type="text/javascript">
  window.onload = (event) => {
  - window.location.replace("./v2")}
  + window.location.replace("https://docs.opentrons.com/v2/")}
  </script>
  </head>
  <h3>Your browser should automatically redirect you from this page.</h3>
  But if it does not, click one of the following links to go to the docs:
  <ul>
  - <li><a href="v1/index.html">OT-2 Python Protocol API Version 1 Documentation</a></li>
  <li><a href="v2/index.html">OT-2 Python Protocol API Version 2 Documentation</a></li>
  + <li><a href="v1/index.html">OT-2 Python Protocol API Version 1 Documentation</a></li>
  <li><a href="ot1/index.html">OT-1 Python Protocol API Documentation</a></li>
  </ul>
  </body>
  