Add a dashboard

Currently the dashboard allows users to get a quick overview of the
status of jobs they're interested in, but more will be added,
e.g. viewing all your jobsets or all jobs of which you're a
maintainer.

src/root/static/css/hydra.css

@@ -97,5 +97,14 @@ td.nowrap {
 }
 
 .actions {
-  font-weight:bold;
+    font-weight: bold;
 }
+
+.star {
+    color: black;
+    font-size: 110%;
+}
+
+.star:hover {
+    cursor: pointer;
+}