config_service: add routing for config-set page.

appengine/config_service/ui/src/config-ui/config-set-card.html

 <!--
   Copyright 2017 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 -->
 
 <link rel="import" href="../../bower_components/paper-item/paper-item.html">
 <link rel="import" href="../../bower_components/polymer/polymer.html">
 
-<dom-module id="config-card">
+<dom-module id="config-set-card">
   <template>
     <style>
       .center {
         margin: auto;
         width: 25%;
         border-style: solid;
         border-width: 2px;
       }
     </style>
 
-    <paper-item class="center">
+    <paper-item class="center" id="paper-box">
       <!-- TODO(cwpayton): Add launch icon next to the name of the config
         so that upon clicking the icon, the user will be taken to the config
         set page. -->
       [[name]]
     </paper-item>
   </template>
   <script>
     Polymer({
-      is: "config-card",
+      is: "config-set-card",
 
       properties: {
         name: {
           type: String
         }
       }
+
     });
   </script>
 </dom-module>
+