use icon instead of help button

Netdisco/views/device.tt

@@ -1,5 +1,16 @@
 <i class="sidebar_toggle icon-wrench icon-large" id="sidebar_toggle_img_out"
   rel="tooltip" data-placement="left" data-offset="5" title="Show Sidebar"></i>
+<i class="icon-question-sign icon-large" id="netmap_help_img" rel="popover"
+  data-title="Neighbor Map Controls"
+  data-html="true"
+  data-content="
+    <ul>
+      <li>Click and drag to pan</li>
+      <li>Mouse-wheel scroll to zoom</li>
+      <li>Hover to hightlight neighbors</li>
+      <li>Click to view device's map</li>
+    </ul>"
+  data-placement='left' data-trigger='click'></i>
 <div class="container-fluid">
   <div class="sidebar sidebar_pinned">
     <div class="well">