Add "shutdown" button to the user interface

[JacTra]

Would it be possible to add "shutdown" button to the user interface to completely power off the unit?

This would be very useful if - for whatever reason - the unit needs to be shutdown remotely (e.g., traveling on holidays and hardware failure occurs - the unit could be turned off instead of having it run on overheat idle mode for days / weeks). The known caveat would be that there'd be no way of remotely turning the unit back on, of course.

[duckaxe]

I can imagine putting the Shutdown button and the Stop Mining button #927 together in the system view below the system metrics. This is where the user would most likely expect to find them.

[skot]

The bitaxe hardware does not have a mechanism for a complete shutdown. The best we can do is turn off the ASIC voltage regulator and halt the ESP32. This will be a very low power state, but not completely off.