config_service: release the UI to the front page

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

Index: appengine/config_service/ui/src/config-ui/config-ui.html
diff --git a/appengine/config_service/ui/src/config-ui/config-ui.html b/appengine/config_service/ui/src/config-ui/config-ui.html
index 440b7b30531cadb9dd226ae7c74afd40a2fa5b44..5318afdb5196318e67e1f1e146a70a273da0cd94 100644
--- a/appengine/config_service/ui/src/config-ui/config-ui.html
+++ b/appengine/config_service/ui/src/config-ui/config-ui.html
@@ -38,6 +38,12 @@
         font-size: 125%;
         color: white;
       }
+
+      .link {
+        font-size: 75%;
+        color: white;
+        margin-right: 10px;
+      }
     </style>
 
     <app-drawer-layout fullbleed force-narrow>
@@ -49,6 +55,11 @@
               Configuration Service
             </div>
 
+            <a href="https://luci-config.appspot.com/_ah/api/explorer" 
+               class="link" 
+               target="_blank"> APIs explorer 
+            </a>
+
             <template is="dom-if" if="[[client_id]]">
               <auth-signin
                   class="right"