Cleanup old cluster files

clusters/okd4/.sops.pub.asc

clusters/okd4/apps.yaml

clusters/okd4/cert-manager/clusterIssuer.yaml

clusters/okd4/cert-manager/kustomization.yaml

clusters/okd4/flux-system/gotk-components.yaml

clusters/okd4/flux-system/gotk-sync.yaml

clusters/okd4/flux-system/gpg-keys.yaml

clusters/okd4/flux-system/kustomization.yaml

clusters/okd4/flux-system/receiver.yaml

clusters/okd4/flux-system/webhook-secret.yaml

clusters/okd4/hcloud-csi/kustomization.yaml

clusters/okd4/hcloud-csi/secret.yaml

clusters/okd4/infrastructure.yaml

clusters/okd4/machine-config/kustomization.yaml

clusters/okd4/machine-config/master/99-master-chrony.yaml

...okd4/machine-config/master/99-master-disk-encryption.yaml

clusters/okd4/machine-config/worker/99-worker-chrony.yaml

...okd4/machine-config/worker/99-worker-disk-encryption.yaml

...kd4/openshift-image-registry/default-registry-config.yaml

clusters/okd4/openshift-image-registry/kustomization.yaml