Add disclaimer for docker example

Container image best practises are missing. We should add this disclaimer until they were implemented.

Author: slm0n87

examples/readme.md

@@ -17,6 +17,9 @@
 
 ## 🛠️ Setup Instructions
 
+### ⚠️ Disclaimer
+
+This setup is provided as an **example only** and is **not ready for production use**. It lacks container image best practices, such as proper security hardening, minimal image sizes, and other considerations necessary for production environments. Use at your own risk and ensure you follow best practices before deploying to production.
 
 ### 1. Create a file named `stackit.ini` in the root directory:
 
@@ -42,4 +45,4 @@ docker compose up certbot
 The certs and the live folder will be `root:root`, in order to access them with your user
 ```bash
 sudo chown -R $(id -u):$(id -g) ./letsencrypt
-```
+```