fix: add missing foundation.js reference comment

Author: DanielRuf

docs/layout/default.html

@@ -77,7 +77,9 @@ <h5 class=""><strong>To master everything new in 6.4, along with the rest of Fou
     var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
   })();
   </script>
-
+  <!--
+  <script src="assets/js/foundation.js"></script>
+  -->
   <script src="assets/js/vendor.js"></script>
   <script src="assets/js/plugins/foundation.core.js"></script>
   <script src="assets/js/plugins/foundation.util.box.js"></script>