Pin A0 mapping

A0 can be connected to VB on the FireBeetle ESP32 board (if R10 and R11 are assembled), but it is also connected to the external input J5.1 via a voltage divider.
To be able to use both ADC input sources independently, the analog inputs of the LoRaWAN_Node PCB should be changed from A0...3 to A1...4.
