fix(dashboard): disable some tab indexes.

mod/dashboard/app/index.html

@@ -24,9 +24,9 @@
     <div id="view-container" ng-view></div>
 
     <div id="footer">
-      <div id="powered-by" class="text-center">Powered by <a href="https://github.com/coreos/etcd">etcd</a></div>
+      <div id="powered-by" class="text-center">Powered by <a href="https://github.com/coreos/etcd" tabindex="-1">etcd</a></div>
       <div id="coreos-logo">
-        <a href="http://coreos.com"><img src="images/logo.svg"/></a>
+        <a href="http://coreos.com" tabindex="-1"><img src="images/logo.svg"/></a>
       </div>
     </div>
 

mod/dashboard/app/views/home.html

@@ -1,4 +1,4 @@
-<a href="stats">stats only</a>
+<a href="stats" tabindex="-1">stats only</a>
 <div ng-include="prefixUrl('/views/stats.html')" class="home-container"></div>
-<a href="browser">browser only</a>
+<a href="browser" tabindex="-1">browser only</a>
 <div ng-include="prefixUrl('/views/browser.html')" class="home-container"></div>