auto-refresh menu, no-clusters page + navigation fixes

Signed-off-by: Roman <ixrock@gmail.com>

src/common/cluster-store.ts

@@ -77,10 +77,6 @@ export class ClusterStore extends BaseStore<ClusterStoreModel> {
   @observable removedClusters = observable.map<ClusterId, Cluster>();
   @observable clusters = observable.map<ClusterId, Cluster>();
 
-  @computed get activeCluster(): Cluster | null {
-    return this.getById(this.activeClusterId);
-  }
-
   @computed get clustersList(): Cluster[] {
     return Array.from(this.clusters.values());
   }