Initial commit for Postgres Operator UI (#613)

* Initial commit for our basic Postgres Operator UI:
 * Create and modify Postgres manifests
 * Watch Operator Logs in the UI
 * Observe cluster creation progress
 * S3 Backup browser for clone and restore

Many thanks to Manuel Gomez and Jan Mussler for the initial UI work a long time ago!

ui/manifests/ingress.yaml

@@ -0,0 +1,15 @@
+apiVersion: "networking.k8s.io/v1beta1"
+kind: "Ingress"
+metadata:
+  name: "postgres-operator-ui"
+  namespace: "default"
+  labels:
+    application: "postgres-operator-ui"
+spec:
+  rules:
+    - host: "ui.example.org"
+      http:
+        paths:
+          - backend:
+              serviceName: "postgres-operator-ui"
+              servicePort: 80