add: warn pre-alpha-state

json/pdm.json

@@ -35,6 +35,10 @@
       {
         "text": "Set a root password if using autologin. This will be the PBS password. `sudo passwd root`",
         "type": "info"
+      },
+      {
+        "text": "Proxmox Datacenter Manager is in an alpha stage of development. Use it cautiously, as bugs, incomplete features, and potential instabilities are expected.",
+        "type": "warning"
       }
     ]
   }