default kustomization.yaml not correct

You're default kustomization is not correct.

in your image section there is no image called
`ghcr.io/alexellis/registry-creds-controller`
Also there is a double entry `ghcr.io` in your registry-creds image.

Why did you add a namePrefix?
Think this is a better option

```
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

namespace: registry-creds-system

resources:
- ../crd
- ../rbac
- ../controller
images:
- name: ghcr.io/alexellis/registry-creds
newTag: latest
```