Remove namespace resource

This is done so that we don't delete the namespace when running `make undeploy`

config/manager/manager.yaml

@@ -1,10 +1,3 @@
-apiVersion: v1
-kind: Namespace
-metadata:
-  labels:
-    control-plane: controller-manager
-  name: system
----
 apiVersion: apps/v1
 kind: Deployment
 metadata: