Retire openstack-helm-docs

As of our discussions from the last PTG, as well as several
prior, one of the goals for the openstack-helm project is to
retire any of the unused repositories under the openstack-helm
projects umbrella.

This change seeks to retire the openstack-helm-docs repo since
it hasn't been maintained and all the documentation lives within
the openstack-helm repo itself.

Depends-on: https://review.opendev.org/c/openstack/openstack-helm-docs/+/839429

Change-Id: Id6d8333c35d27d42c4ac3661971f6c5396b0aa1f

reference/legacy.yaml

@@ -662,7 +662,16 @@ OpenStackAnsible:
       repos:
         - openstack/openstack-ansible-security
 
-
+OpenStackHelm:
+  irc-channel: openstack-helm
+  partial: yes
+  service: Helm charts for deploying OpenStack
+  url: https://wiki.openstack.org/wiki/Openstack-Helm
+  deliverables:
+    openstack-helm-docs:
+      retired-on: 2022-04-27
+      repos:
+        - openstack/openstack-helm-docs
 
 OpenStackSalt:
   ptl:

reference/projects.yaml

@@ -1823,10 +1823,6 @@ OpenStack-Helm:
       release-management: external
       repos:
         - openstack/openstack-helm-deployments
-    openstack-helm-docs:
-      release-management: external
-      repos:
-        - openstack/openstack-helm-docs
     openstack-helm-images:
       release-management: external
       repos: