core: change directory layout

As per discussion, proposing a new layout for the charts/yaml/olm files.

./deploy
├── charts
│   ├── rook-ceph
│   │   └── templates
│   └── rook-ceph-cluster
│       └── templates
├── examples
│   ├── csi
│   │   ├── cephfs
│   │   └── rbd
│   ├── flex
│   ├── monitoring
│   ├── pre-k8s-1.16
└── olm
    └── assemble

Signed-off-by: Sébastien Han <seb@redhat.com>

deploy/examples/dashboard-external-https.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: rook-ceph-mgr-dashboard-external-https
+  namespace: rook-ceph # namespace:cluster
+  labels:
+    app: rook-ceph-mgr
+    rook_cluster: rook-ceph # namespace:cluster
+spec:
+  ports:
+    - name: dashboard
+      port: 8443
+      protocol: TCP
+      targetPort: 8443
+  selector:
+    app: rook-ceph-mgr
+    rook_cluster: rook-ceph
+  sessionAffinity: None
+  type: NodePort