Add warning about deprecated deployment repo

Updated deployment guide to note deprecation of the repo and recommend using neuvector HELM for manifests.

Author: venkateshjayagopal

docs/02.deploying/02.kubernetes/02.kubernetes.md

@@ -5,6 +5,9 @@ taxonomy:
 slug: /deploying/kubernetes
 ---
 
+:::warning attention
+The repo used in this deployment guide (https://raw.githubusercontent.com/neuvector/manifests/) has been deprecated. Please use neuvector HELM to create manifest for deploying neuvector components.
+
 ### Deploy Using Kubernetes
 
 You can use Kubernetes to deploy separate manager, controller and enforcer containers and make sure that all new nodes have an enforcer deployed. NeuVector requires and supports Kubernetes network plugins such as flannel, weave, or calico.