Drop Debian 12 from list of supported operating systems

source/more-info/unsupported/os.markdown

@@ -5,24 +5,13 @@ description: "More information on why the OS marks the installation as unsupport
 
 ## The issue
 
-There are only two supported operating systems to run the Supervisor on:
-
-- Home Assistant OS
-- Debian 12 (Bookworm)
-
-These operating systems are actively tested and maintained, for use with the Supervisor.
+The Home Assistant Supervisor is only supported on Home Assistant OS.
 
 ## The solution
 
-You need to reinstall the host machine running the Supervisor on one of the supported
-operating systems.
-
-The best approach here is to take a full backup of your current installation
-from the Supervisor panel, then reinstall your host with one of the supported
-operating systems.
-
-If the host is a virtual machine or a supported board, you can use our [appliance images](/hassio/installation/).
-
-If not, you can get [Debian from here](https://www.debian.org/) and use our [convenience installation script](https://github.com/home-assistant/supervised-installer). Make sure you make it compliant with [ADR-0014](https://github.com/home-assistant/architecture/blob/master/adr/0014-home-assistant-supervised.md), the convenience script will handle most of that for you.
+You need to reinstall the host machine running the Supervisor using Home Assistant OS.
 
-When the new host is set up and you can reach the Home Assistant frontend, you can upload and restore the backup you made earlier.
+The best approach here is to [create a backup](/common-tasks/general/#backups) of your
+current installation, then reinstall your system using Home Assistant OS. During
+[Onboarding of Home Assistant](/getting-started/onboarding/), choose to **Restore from
+backup**.