[incubator/schema-registry] deprecating chart (#24272)

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

incubator/schema-registry/Chart.yaml

@@ -1,12 +1,12 @@
 name: schema-registry
 home: https://docs.confluent.io/current/schema-registry/docs/index.html
-version: 1.2.2
+version: 1.2.3
 appVersion: 5.0.1
 keywords:
   - confluent
   - kafka
   - schema-registry
-description: Schema Registry provides a serving layer for your metadata. It provides a RESTful
+description: DEPRECATED Schema Registry provides a serving layer for your metadata. It provides a RESTful
   interface for storing and retrieving Avro schemas. It stores a versioned history of all schemas,
   provides multiple compatibility settings and allows evolution of schemas according to the
   configured compatibility setting. It provides serializers that plug into Kafka clients that
@@ -16,6 +16,4 @@ apiVersion: v1
 sources:
 - https://github.com/confluentinc/schema-registry
 - https://github.com/confluentinc/cp-docker-images
-maintainers:
-- name: benjigoldberg
-  email: ben@spothero.com
+deprecated: true

incubator/schema-registry/OWNERS

@@ -1,4 +0,0 @@
-approvers:
-- benjigoldberg
-reviewers:
-- benjigoldberg

incubator/schema-registry/README.md

@@ -6,6 +6,10 @@ For more information, see the Helm Charts [Deprecation and Archive Notice](https
 # Schema-Registry Helm Chart
 This helm chart creates a [Confluent Schema-Registry server](https://github.com/confluentinc/schema-registry).
 
+## DEPRECATION NOTICE
+
+This chart is deprecated and no longer supported.
+
 ## Prerequisites
 * Kubernetes 1.6
 * A running Kafka Installation