cleanup nextcloud role

roles/nextcloud/defaults/main.yaml

@@ -3,11 +3,6 @@ nextcloud_publish: false
 nextcloud_use_external_db: true
 nextcloud_short_name: "nextcloud"
 nextcloud_default_values:
-  image:
-    repository: nextcloud
-    tag: 20.0-apache
-    pullPolicy: Always
-  replicaCount: 1
   ingress:
     enabled: true
     annotations: 
@@ -155,10 +150,6 @@ nextcloud_default_values:
   ##
   cronjob:
     enabled: true
-    # Nexcloud image is used as default but only curl is needed
-    image:
-      repository: nextcloud
-      tag: 20.0-apache
     schedule: "*/5 * * * *"
     annotations: {}
     # Set curl's insecure option if you use e.g. self-signed certificates