[stable/atlantis] deprecating chart (#23841)

Signed-off-by: Torsten Walter <torsten.walter@syncier.com>

stable/atlantis/Chart.yaml

@@ -1,17 +1,15 @@
 apiVersion: v1
+# The prometheus-operator chart is deprecated and no longer maintained. For details deprecation,
+# including how to un-deprecate a chart see the PROCESSES.md file.
+# This chart was moved to https://github.com/runatlantis/helm-charts
+deprecated: true
 appVersion: v0.14.0
-description: A Helm chart for Atlantis https://www.runatlantis.io
+description: DEPRECATED A Helm chart for Atlantis https://www.runatlantis.io
 name: atlantis
-version: 3.12.2
+version: 3.12.3
 keywords:
 - terraform
 home: https://www.runatlantis.io
 icon: https://www.runatlantis.io/hero.png
 sources:
 - https://github.com/runatlantis/atlantis
-maintainers:
-- name: jkodroff
-- name: callmeradical
-- name: jeff-knurek
-- name: lkysow
-- name: anubhavmishra

stable/atlantis/README.md

@@ -1,4 +1,7 @@
 # Atlantis
+
+# ⚠️  DEPRECATED Further development was moved to https://github.com/runatlantis/helm-charts
+
 [Atlantis](https://www.runatlantis.io/) is a tool for safe collaboration on [Terraform](https://www.terraform.io/) repositories.
 
 ## Introduction