Clarify which port rhasspy uses by default for MQTT.

[jasonhildebrand]

Doc update to tell people what Rhasspy's default MQTT port is. It is not prominent in Rhasspy's documentation.

After I tried the example apps and 1883 didn't work, I tried using 12101. The app connected and printed some debug information (no errors), so appeared to be working. But it didn't receive up the expected MQTT messages. After digging into the issue queue I found #14 and that clued me in. Then there was the matter of adjusting the docker config to expose this port.

I think this deserves to be added to the docs in a prominent spot.

[koenvervloesem]

Thanks for this contribution! Indeed it deserves to be in a prominent spot.

To improve on this even further: I think this section should make it clear that you should use the same settings as you have set in Rhasspy. If you're using Rhasspy's internal MQTT broker, do this (what you have written now), if you're using an external MQTT broker, do that (most brokers use 1883).

Can you add this?

[jasonhildebrand]

OK, I've added more to clarify that use case.

[koenvervloesem]

Excellent, thanks!