Add more-info about unhealthy setups (#15729)

Co-authored-by: Franck Nijhof <git@frenck.dev>

source/more-info/unhealthy/docker.markdown

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+---
+title: "The Docker environment is not working properly"
+description: "More information on why a misconfigured Docker environment marks the system as unhealthy."
+---
+
+Docker is at the core of most operations that the Supervisor does, it is important that it is configured properly and is working the way the Supervisor expects.
+
+The Supervisor will be marked as unhealthy if any of these requirements are not met:
+
+- [Running containers known to cause issues](/more-info/unsupported/container)
+- [Running an unsupported Docker version](/more-info/unsupported/docker_version)
+- [Running the Supervisor under LXC](/more-info/unsupported/lxc)
+- [Not running the Supervisor as privileged](/more-info/unsupported/privileged)

source/more-info/unhealthy/setup.markdown

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+---
+title: "Setup of the Supervisor failed"
+description: "More information on why failing the setup stage makes an installation as unhealthy."
+---
+
+## The issue
+
+This happens when any of the setup tasks fails to complete, this can be due to the host not being completely ready when the Supervisor starts or that [DBUS] is not properly working.
+
+## The solution
+
+If the issue is related to DBUS, you will see an unsupported message about that as well; You can have a look [here][DBUS] on how to resolve that.
+
+The first thing you should try is to restart the Supervisor.
+This can be done from the "System" tab in the Supervisor panel. On the card for "Supervisor", there is a button to restart the Supervisor.
+
+This can also be done with the CLI, by running the following command:
+
+```bash
+ha supervisor restart
+```
+
+
+If this does not help, you can try to reboot the host.
+If you are running Home Assistant Operating System, this can be done from the "System" tab in the Supervisor panel. On the card for "Host System", there is a button to reboot the host.
+
+To help us make the setup more robust, please enable the sharing of diagnostics and crash logs on the "System" tab in the Supervisor panel.
+
+[DBUS]: /more-info/unsupported/dbus

source/more-info/unhealthy/supervisor.markdown

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+---
+title: "Supervisor was not able to update"
+description: "More information on why a failed Supervisor update marks a system as unhealthy."
+---
+
+## The issue
+
+This can happen when there was a network issue during the startup of the Supervisor.
+
+## The solution
+
+Manually update the Supervisor. This can be done from the "System" tab in the Supervisor panel. On the card for "Supervisor", there is a button to update the Supervisor.
+
+This can also be done with the CLI, by running the following command:
+```bash
+ha supervisor update
+```