feat(chart): apply commonLabels to all rendered resources (#739)

Applies commonLabels to every rendered resource, wires up the likewise-unused dashboard.persistence.labels, and adds the missing README rows.

Closes #730

Co-authored-by: ashutoshbhardwaj007 <ashutosh.bhardwaj@poppulo.com>

charts/helm-dashboard/templates/serviceaccount.yaml

@@ -14,6 +14,8 @@ kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: {{ include "helm-dashboard.serviceAccountName" . }}
+  labels:
+    {{- include "helm-dashboard.labels" . | nindent 4 }}
 rules:
   - apiGroups: ["*"]
     resources: ["*"]
@@ -28,6 +30,8 @@ apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 metadata:
   name: {{ include "helm-dashboard.serviceAccountName" . }}
+  labels:
+    {{- include "helm-dashboard.labels" . | nindent 4 }}
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole