Update index.html

Author: AionSystem

index.html

@@ -263,6 +263,7 @@
     <li><a href="/case-studies/">Case-Studies</a></li>
     <li><a href="/stack/">Stack-Tools</a></li>
     <li><a href="/certify/">Certify</a></li>
+    <li><a href="/dev-tools/">Dev-Tools</a></li>
     <li><a href="/about/">About</a></li>
     <li><a href="https://www.linkedin.com/in/sheldon-k-salmon-b0901b378" target="_blank">LinkedIn ↗</a></li>
   </ul>