docs(amplify): add end-of-life banner for NGINX Amplify (#1314)

Author: travisamartin

_banners/eol-amplify.md

@@ -0,0 +1,14 @@
+{{< banner "warning" "Support for NGINX Amplify Ends January 31, 2026" >}}
+
+NGINX Amplify support ends on January 31, 2026. To continue monitoring your NGINX instances, migrate to the NGINX One Console, part of the NGINX One product offering.
+
+**Transition steps:**
+
+1. [Contact the F5 NGINX Sales team](https://www.f5.com/products/get-f5/f5-nginx-products-and-packaging) to get an NGINX One subscription, if you don’t already have one.
+2. [Uninstall the NGINX Amplify agent]({{< ref "/amplify/nginx-amplify-agent/install/uninstalling-amplify-agent.md" >}}).
+3. [Follow the NGINX One Console getting started guide]({{< ref "/nginx-one/getting-started.md" >}}).
+
+[Professional Services](https://www.f5.com/services) are available to support your transition. Additional fees may apply.
+
+More details: [Read the community announcement](https://blog.nginx.org/blog/nginx-amplify-endoflife).
+{{</ banner >}}

content/amplify/_index.md

@@ -4,5 +4,9 @@ description: Lightweight SaaS monitoring and static analysis for NGINX Open Sour
 url: /nginx-amplify/
 cascade:
   logo: "NGINX-Amplify-product-icon-RGB.svg"
+  nd-banner:
+    enabled: true
+    type: deprecation
+    md: _banners/eol-amplify.md
 ---