Reverts docs changes from 143b2c3 that incorrectly replaced
kube-system with headlamp for sealed-secrets-controller commands.
The sealed-secrets-controller runs in kube-system, NOT headlamp.
Only the Headlamp app install namespace was changed to headlamp.
Changes:
- Revert -n headlamp → -n kube-system in all sealed-secrets-controller
kubectl commands across all docs files
- Revert sealed-secrets-controller.kube-system DNS reference
- Revert --controller-namespace=headlamp → --controller-namespace=kube-system
- Revert 'namespace headlamp' → 'namespace kube-system' in error messages
Co-Authored-By: Paperclip <noreply@paperclip.ing>