chore: Unset deprecated .{web,worker}.image fields

This suppresses the deprecation notice, unless the user explicitly sets
the deprecated fields.

This change should be non-breaking, since we've set the image via
`.Values.image` already.

Author: lindhe

charts/invenio/values.yaml

@@ -233,8 +233,8 @@ nginx:
         - ALL
 
 web:
-  image: "ghcr.io/inveniosoftware/demo-inveniordm/demo-inveniordm:v12.0.0-beta.1.3"
-  imagePullSecret: ""
+  image: ""  # DEPRECATED: Use `.Values.image` instead!
+  imagePullSecret: ""  # DEPRECATED: Use `.Values.image.imagePullSecrets` instead!
   replicas: 6
   terminationGracePeriodSeconds: 60
   uwsgi:
@@ -357,8 +357,8 @@ web:
 
 worker:
   enabled: true
-  image: "ghcr.io/inveniosoftware/demo-inveniordm/demo-inveniordm:v12.0.0-beta.1.3"
-  imagePullSecret: ""
+  image: ""  # DEPRECATED: Use `.Values.image` instead!
+  imagePullSecret: ""  # DEPRECATED: Use `.Values.image.imagePullSecrets` instead!
   app: invenio_app.celery
   concurrency: 2
   log_level: INFO