fix: simplify helmfile manifest charts a bit

helmfile.d/nfs-provisioner.yaml.gotmpl

@@ -21,9 +21,9 @@ releases:
   postRendererArgs:
   - ../values/nfs-provisioner/kustomize/{{ .Environment.Name }}
   missingFileHandler: Info
-- name: nfs-provisioner-manifests
+- name: manifests
   namespace: kube-system 
-  chart: _nfs-provisioner-manifests
+  chart: manifests
   condition: nfs_provisioner.enabled
   missingFileHandler: Info
   values:
@@ -40,4 +40,4 @@ releases:
     - '{{`{{ .Release.Chart }}`}}'
     - '{{`{{ .Environment.Name }}`}}'
     - ../values/nfs-provisioner/manifests
-    - _nfs-provisioner-manifests
+    - manifests