Update Argo CD README and root-application.yaml to clarify prerequisites, enhance Ingress configuration with Traefik and cert-manager, and specify finalizer guidance for resource deletion. Adjust instructions for accessing the Argo CD UI and managing applications.

clusters/noble/bootstrap/argocd/root-application.yaml

@@ -11,8 +11,11 @@ kind: Application
 metadata:
   name: noble-root
   namespace: argocd
+  # Path suffix satisfies Kubernetes’ domain-qualified finalizer guidance (avoids kubectl warning).
+  # Background cascade: Application deletes after resources are removed asynchronously.
+  # See: https://argo-cd.readthedocs.io/en/stable/user-guide/app_deletion/#about-the-deletion-finalizer
   finalizers:
-    - resources-finalizer.argocd.argoproj.io
+    - resources-finalizer.argocd.argoproj.io/background
 spec:
   project: default
   source: