Update index.php - Adding AWS implementation (#834)

Adding a link in the Library section.
New link to an oEmbed provider serverless implementation made by AWS and now available in aws-samples.
This implementation is fully serverless and can be used as boilerplate to easily serve an oEmbed endpoint.

Maybe this link could be further down in the page with the Webmonkey tutorial?

Author: koxon

www/index.php

@@ -493,6 +493,7 @@
 	<li>Node.js: oEmbed API Gateway (<a href="https://github.com/itteco/iframely">https://github.com/itteco/iframely</a>)</li>
 	<li>Elixir: furlex (<a href="https://github.com/claytongentry/furlex">https://github.com/claytongentry/furlex</a>)</li>
 	<li>Elixir: elixir-oembed (<a href="https://github.com/r8/elixir-oembed">https://github.com/r8/elixir-oembed</a>)</li>
+	<li>AWS: Serverless oEmbed provider (<a href="https://github.com/aws-samples/sample-serverless-oembed">https://github.com/aws-samples/sample-serverless-oembed</a>)</li>
 </ul>