Remove placeholder text from UI topology page.

src/main/resources/web/tpl/topology.html

@@ -3,7 +3,6 @@
 <div class="page-header">
 	<h1>Network Topology</h1>
 </div>
-<p>Beautiful topology graph goes here</p>
 <div id="topology-graph"></div>
 </div>
 </div>