Remove old stack-basicstack-de complex sync manifest

The old recursive directory sync has been replaced with individual
Application manifests. The Application resource was deleted from the
cluster and this file is no longer needed.

Related: DEV-287

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/app-stack-basicstack-de.yaml

@@ -1,26 +0,0 @@
-# DISABLED: Replaced with individual app syncs (see app-*.yaml files)
-# This complex recursive sync has been decomposed into individual application syncs
-# for better control and visibility. Each app now has its own app-<name>.yaml file.
-#
-# apiVersion: argoproj.io/v1alpha1
-# kind: Application
-# metadata:
-#   name: stack-basicstack-de
-#   namespace: argocd
-# spec:
-#   project: default
-#   source:
-#     repoURL: git@forgejo.forgejo.svc.cluster.local:basicstack/stack.basicstack.de.git
-#     targetRevision: main
-#     path: apps
-#     directory:
-#       recurse: true
-#       exclude: 'argocd/**'
-#   destination:
-#     server: https://kubernetes.default.svc
-#   syncPolicy:
-#     automated:
-#       prune: false  # Manual approval for deletions
-#       selfHeal: true
-#     syncOptions:
-#     - CreateNamespace=true