justanode on Nostr: Is there a good tutorial how to set this up? (I really want this!!! 😄) I got the ...

Is there a good tutorial how to set this up? (I really want this!!! 😄)
I got the clock. Awtrix is flashed.
Umbrel is running, HA installed)
I cannot find information how/where to run/setup the MQTT broker that seems to be needed. I would have assumed that should be on the Umbrel, but there is no app for it?