docs: reinstate deprecation notice for on-prem 1.x

mefellows · mefellows · commit 4e76cd6a1617 · 2025-10-20T22:46:08.000+11:00
diff --git a/website/docs/docs/on-premises.md b/website/docs/docs/on-premises.md
@@ -3,6 +3,13 @@ title: PactFlow On-Premises Architecture
 sidebar_label: Architecture
 ---
 
+:::warning
+PactFlow On-Premises 1.x is now in maintenance mode and receives security updates only. It will no longer be supported after March 11, 2026.
+
+To benefit from the latest features and improvements, upgrade to version 2.x as soon as possible.
+:::
+
+
 ## System architecture
 
 ### Minimum requirements
