fix: Update bootstrap kustomization and include note in file

kubernetes/bootstrap/kustomization.yaml

@@ -1,9 +1,12 @@
+# IMPORTANT: This file is not tracked by flux and should never be. Its
+# purpose is to only install the Flux components and CRDs into your cluster.
 ---
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - github.com/fluxcd/flux2/manifests/install?ref=v2.0.0-rc.1
 patches:
+  # Remove the network policies that does not work with k3s
   - patch: |-
       $patch: delete
       apiVersion: networking.k8s.io/v1
@@ -12,5 +15,4 @@ patches:
         name: not-used
     target:
       group: networking.k8s.io
-      version: v1
       kind: NetworkPolicy