Add warning to the user Readme file (#209)

* Add warning to the user Readme file

* Fix sidebar

* Fix titles

docs/user/README.md

@@ -2,6 +2,9 @@
 
 ## What is the Docker Registry Module?
 
+> [!WARNING]  
+> Do not use Docker Registry in production clusters, where a full-fledged, highly-available, production-grade registry is necessary.
+
 The Docker Registry module is a Kubernetes operator that adds the Docker Registry capability to a Kubernetes cluster. It installs packaged distribution images and configures them to be easily used in Kyma runtime.
 
 ## What is Docker Registry in Kyma?

docs/user/_sidebar.md

@@ -3,8 +3,8 @@
 - [Docker Registry Module Configuration](/docker-registry/user/00-20-configure-docker-registry.md)
 - [Docker Registry Storage Configuration](/docker-registry/user/00-30-storage-configuration.md)
 - [Tutorials](/docker-registry/user/tutorials/README.md)
-  - [Docker Registry Configuration](/docker-registry/user/tutorials/00-20-configure-docker-registry.md)
-  - [Registry Storage Configuration](/docker-registry/user/tutorials/00-30-storage-configuration.md)
+  - [Use Docker Registry Internally](/docker-registry/user/tutorials/01-10-use-registry-internally.md)
+  - [Expose Docker Registry](/docker-registry/user/tutorials/01-20-expose-registry.md)
 - [Resources](/docker-registry/user/resources/README.md)
   - [Docker Registry Custom Resource](/docker-registry/user/resources/06-20-docker-registry-cr.md)
 -

docs/user/tutorials/01-10-use-registry-internally.md

@@ -1,4 +1,4 @@
-# Use Registry Internally
+# Use Docker Registry Internally
 
 This tutorial shows how you can push an image to the Docker Registry and use it.
 

docs/user/tutorials/01-20-expose-registry.md

@@ -1,4 +1,4 @@
-# Expose Registry
+# Expose Docker Registry
 
 This tutorial shows how you can expose the registry to the outside of the cluster with Istio.