Update index.html

Author: AionSystem

services/index.html

@@ -261,7 +261,8 @@
   <ul class="nav-links">
     <li><a href="/simulators/">Simulators</a></li>
     <li><a href="/services/" class="active">Services</a></li>
-    <li><a href="/stack/">Stack</a></li>
+    <li><a href="/stack/">Stack-Tools</a></li>
+    <li><a href="/case-studies/">Case-Studies</a></li>
     <li><a href="/certify/">Certify</a></li>
     <li><a href="/submissions/">Submissions</a></li>
     <li><a href="/about/">About</a></li>
@@ -662,4 +663,4 @@ <h2 class="engage-heading">Your IT team builds<em>on proof.</em></h2>
 })();
 </script>
 </body>
-</html>
+</html>