Deprecate stale doc (#9385)

* Deprecate stale doc

* Archive instead of deprecated

Author: rachelwhitton

source/content/crisis-response-upstream.md

@@ -1,5 +1,5 @@
 ---
-title: Crisis Response Upstream
+title: Crisis Response Upstream [Archived]
 description: About the Pantheon COVID-19 Response WordPress Upstream
 tags: [site, upstreams]
 contributors: [carolynshannon, kyletaylored]
@@ -13,6 +13,16 @@ product: [--]
 integration: [--]
 ---
 
+<Alert title="Warning" type="danger">
+
+This page has been archived. The content is no longer maintained and may be outdated.
+
+The [Pantheon Crisis Response WordPress Upstream](https://github.com/pantheon-upstreams/crisis-response-wp) is no longer maintained.
+
+While the upstream and code remains available, it is no longer actively developed or supported.
+
+</Alert>
+
 ## Overview
 
 The **Pantheon Crisis Response WordPress Upstream** is a specialized WordPress [custom upstream](/guides/custom-upstream), created in response to COVID-19, to enable organizations on the front line to quickly create a production-ready website to provide timely information during a crisis.