Add banner to hardware browser directing users to the new interface (#590)

Author: pdmars

g5k_discovery/templates/g5k_discovery/discovery.html

@@ -34,6 +34,16 @@
 </style>
 
 <h1>Hardware Discovery</h1>
+<div class="alert alert-success">
+  <p>
+    🎉 Check out a preview of our <strong>new Hardware Discovery tool</strong>! Try it at
+    <a href="https://discover.chameleoncloud.org" target="_blank">
+      discover.chameleoncloud.org
+    </a>
+    for a better resource discovery experience.
+  </p>
+</div>
+
 <div class="alert alert-info">
   <p>
     We also have virtual machines available! Check out our