REFACTOR(repo): security repo structure

- Add application.yaml for ArgoCD app-of-apps
- Add kustomization.yaml with security components
- Add renovate.json for automated updates
- Update all component argocd.yaml repoURLs to security repo

Components: authelia, vault, external-secrets, falco, trivy

kustomization.yaml

@@ -0,0 +1,10 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - application.yaml
+  - authelia/argocd.yaml
+  - vault/argocd.yaml
+  - external-secrets/argocd.yaml
+  - falco/argocd.yaml
+  - trivy/argocd.yaml