unlist removed examples

www/examples/index.html

@@ -11,12 +11,10 @@
 <ul>
     <li><a href="/examples/form/">forms</a></li>
     <li><a href="/examples/text/">text</a></li>
-    <li><a href="/examples/hack/">textareas with executable content</a></li>
     <li><a href="/examples/board/">kanban board</a></li>
-    <li><a href="/examples/json/">json objects</a></li>
+    <!-- <li><a href="/examples/json/">json objects</a></li> -->
     <li><a href="/examples/read/">ajax-like get/put behaviour</a></li>
     <li><a href="/examples/render/">render markdown content as html</a></li>
     <li><a href="/examples/style/">edit a page's style tag</a></li>
-    <li><a href="/examples/upload/">upload content</a></li>
 </ul>