Add a link to 'How to win at CORS'

Author: cors-errors

index.html

@@ -51,6 +51,10 @@ <h2>Around the web</h2>
       Another CORS guide -
       {% include external-link.html href="https://javascript.info/fetch-crossorigin" %}
     </li>
+    <li>
+      How to win at CORS -
+      {% include external-link.html href="https://jakearchibald.com/2021/cors/" %}
+    </li>
     <li>
       CORS on MDN -
       {% include external-link.html href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" %}