Add back removed rke1-hardening-guide folder

versioned_docs/version-2.12/reference-guides/rancher-security/hardening-guides/rke1-hardening-guide/rke1-hardening-guide.md

@@ -510,4 +510,4 @@ rancher_kubernetes_engine_config:
 
 ## Conclusion
 
-If you have followed this guide, your RKE custom cluster provisioned by Rancher will be configured to pass the CIS Kubernetes Benchmark. You can review our RKE self-assessment guides to understand how we verified each of the benchmarks and how you can do the same on your cluster.
+If you have followed this guide, your RKE custom cluster provisioned by Rancher will be configured to pass the CIS Kubernetes Benchmark. You can review our RKE self-assessment guides to understand how we verified each of the benchmarks and how you can do the same on your cluster.