refactor - file naming conversion

kubernetes/rpi5-cluster/apps/cert-manager/kustomization.yaml

@@ -1,4 +1,4 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - ks.yaml
+  - cert-manager.yaml

kubernetes/rpi5-cluster/apps/cilium/kustomization.yaml

@@ -1,4 +1,4 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - ks.yaml
+  - cilium.yaml

kubernetes/rpi5-cluster/apps/podinfo/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - podinfo.yaml

kubernetes/rpi5-cluster/infrastructure/kustomization.yaml

@@ -1,5 +1,5 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - repositories/ks.yaml
-  - secrets/ks.yaml
+  - repositories/repositories.yaml
+  - secrets/secrets.yaml