link to public dashboard in admin options, add return button do public dashboard

web/frontend/src/config.entrypoint.js

@@ -10,6 +10,7 @@ mount(Config, {
         isApi: isApi,
         username: username,
         ncontent: ncontent,
+        clusters: hClusters.map((c) => c.name) // Defined in Header Template
     },
     context: new Map([
             ['cc-config', clusterCockpitConfig],