chore: remove default namespace

Author: scotwells

config/manager/manager.yaml

@@ -1,12 +1,3 @@
-apiVersion: v1
-kind: Namespace
-metadata:
-  labels:
-    control-plane: controller-manager
-    app.kubernetes.io/name: datum
-    app.kubernetes.io/managed-by: kustomize
-  name: system
----
 apiVersion: apps/v1
 kind: Deployment
 metadata: