docs: Highlight non-production status (#212)

Signed-off-by: Jann Fischer <[email protected]>

Author: jannfis

README.md

@@ -12,7 +12,8 @@ Some might refer to this architecture as "hub and spokes" or the "pull model" wi
 
 ## Status and current limitations
 
-**Important notice:** The `argocd-agent` project has just been born and is far from ready for general consumption. We decided to make the code available as early as possible to attract potential collaborators and contributors along the way, and to get input from the community as the project progresses.
+> [!IMPORTANT]
+> **Important notice:** The `argocd-agent` project has just been born and is far from ready for general consumption. We decided to make the code available as early as possible to attract potential collaborators and contributors along the way, and to get input from the community as the project progresses.
 
 You can check the
 [issue tracker](https://github.com/argoproj-labs/argocd-agent/issues)