Merge branch 'olm' into 'master'

Add UI elements with OLM

See merge request !27

chart/drupalsite-operator/olm-catalog/drupalsite-operator/drupalsite-operator.package.yaml

+channels:
+- currentCSV: drupalsite-operator.v0.0.1
+  name: alpha
+defaultChannel: alpha
+packageName: drupalsite-operator

chart/drupalsite-operator/templates/operatorgroup.yaml

+# configures the namespaces where our operator is made available.
+# The OperatorGroup applies to all operators (CSVs) in its parent namespace.
+apiVersion: operators.coreos.com/v1
+kind: OperatorGroup
+metadata:
+  annotations:
+    # this annotation will be managed by the OLM. If we set it, ArgoCD will be continuously out of sync.
+    # olm.providedAPIs: DrupalSite.v1alpha1.drupal.webservices.cern.ch
+  name: drupalsite-operator
+spec: {}
+# spec.targetNamespaces is not set, this means deploy to all namespaces
+# (OLM will copy the operator CSV to each namespace in the cluster!)