Implement target selection, autodiscovery via aggregator, implement listTargets

cmd/frontend/templates/index.html

@@ -13,6 +13,13 @@
 {{- end}}
 </div>
 
+{{if .Targets}}<div class="tabs tabs-targets">
+  <span class="tabs-label">source:</span>
+{{- range .Targets}}
+  <a href="{{.URL}}"{{if .Active}} class="active"{{end}}>{{.Label}}</a>
+{{- end}}
+</div>{{end}}
+
 <form class="filter-form" method="get" action="/">
   <input type="hidden" name="target" value="{{.Params.Target}}">
   <input type="hidden" name="w" value="{{.Params.WindowS}}">