chore(readme): add archive message

Author: m4s-b3n

README.md

@@ -1,5 +1,8 @@
 # terraform-helm-github-actions-runner-controller
 
+> [!CAUTION]
+> Archived as not required anymore
+
 [![Test & Release](https://github.com/infinite-automations/terraform-helm-github-actions-runner-controller/actions/workflows/test-and-release.yml/badge.svg)](https://github.com/infinite-automations/terraform-helm-github-actions-runner-controller/actions/workflows/test-and-release.yml)
 
 Setup the GitHub Actions Runner Controller (ARC) in an existing kubernetes cluster.
@@ -82,4 +85,4 @@ module "actions-runner-controller" {
 | <a name="output_secret_name"></a> [secret\_name](#output\_secret\_name)                              | The name of the secret created                    |
 
 
-<!-- END_TF_DOCS -->
+<!-- END_TF_DOCS -->