docs: Migration notice

Signed-off-by: Víctor Cuadrado Juan <2196685+viccuad@users.noreply.github.com>

Author: viccuad

README.md

@@ -1,3 +1,10 @@
+> [!IMPORTANT]
+> **Notice:**  
+> Starting from release 1.32.0, all code from this repository has been merged into [github.com/kubewarden/kubewarden-controller](https://github.com/kubewarden/kubewarden-controller), which is now a monorepo.
+> Please refer to that repository for future updates and development.
+>
+> **This repository is now archived. Development continues in the new location.**
+
 # Kubewarden policy context-aware-test-policy
 
 ## Description