fix search, add yaml tutorial

_includes/topnav.html

@@ -70,7 +70,7 @@
                 {% endif %}
                 {% include feedback.html %}
 
-
+                <!--uncomment this block if you want simple search instead of algolia-->
                 <li>
                      <!--start search-->
                     <div id="search-demo-container">
@@ -91,6 +91,7 @@
                     </script>
                      <!--end search-->
                 </li>
+
             {% comment %}
                 {% include frameescape.html %}
                 {% endcomment %}