feat: dashboard status indicator (#2555)

---------

Co-authored-by: Erik Whiting <erik@erikwhiting.com>
Co-authored-by: Anita Caron <anitac@ebi.ac.uk>

Author: 3 people

assets/css/style.css

@@ -22,3 +22,15 @@ in the navigation menu
 .navbar a:hover {
   text-decoration: none;
 }
+
+/*
+Slightly darken failing ontologies
+*/
+
+.failing {
+  background-color: lightgray;
+}
+
+.dash-status {
+    margin-bottom: 3px;
+}