[stable/percona-xtradb-cluster] deprecating chart (#24377)

Signed-off-by: Matt Farina <matt@mattfarina.com>

stable/percona-xtradb-cluster/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v1
 name: percona-xtradb-cluster
-version: 1.0.7
+version: 1.0.8
 appVersion: 5.7.19
-description: free, fully compatible, enhanced, open source drop-in replacement for
+description: DEPRECATED - free, fully compatible, enhanced, open source drop-in replacement for
   MySQL with Galera Replication (xtradb)
 keywords:
 - mysql
@@ -17,7 +17,5 @@ icon: https://www.percona.com/sites/all/themes/percona2015/logo.png
 sources:
 - https://github.com/kubernetes/charts
 - https://github.com/percona-lab/percona-docker/
-maintainers:
-- name: paulczar
-  email: username.taken@gmail.com
+deprecated: true
 engine: gotpl

stable/percona-xtradb-cluster/OWNERS

@@ -1,8 +0,0 @@
-approvers:
-- paulczar
-- maver1ck
-reviewers:
-- paulczar
-- maver1ck
-
-

stable/percona-xtradb-cluster/README.md

@@ -9,6 +9,10 @@ For more information, see the Helm Charts [Deprecation and Archive Notice](https
 
 Notable users include Netflix, Amazon Web Services, Alcatel-Lucent, and Smug Mug.
 
+## DEPRECATION NOTICE
+
+This chart is deprecated and no longer supported.
+
 ## Introduction
 
 This chart, based off of the Percona chart (which in turn is based off the MySQL chart), bootstraps a multi-node Percona XtraDB Cluster deployment on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.