dashboard/app: Add anchor links for BugNamespaces

To make it possible to provide URLs that jump to a specific BugNamespace,
this adds clickable anchors for each of the BugNamespaces without changing
the current appearance of the h2 tag.

dashboard/app/main.html

@@ -111,7 +111,7 @@ Main page.
 
 	{{range $ns := $.BugNamespaces}}
 		<br>
-		<h2 id="{{$ns.Name}}">{{$ns.Caption}}</h2>
+		<a class="plain" href="#{{$ns.Name}}"><h2 id="{{$ns.Name}}">{{$ns.Caption}}</h2></a>
 		{{if $ns.FixedLink}}
 			{{if $ns.CoverLink}}
 				<a href="{{$ns.CoverLink}}" target="_blank">source coverage</a> |

dashboard/app/static/style.css

@@ -127,6 +127,10 @@ table td, table th {
 	font-weight: bold;
 }
 
+.plain {
+	text-decoration: none;
+}
+
 textarea {
 	width:100%;
 	font-family: monospace;