ESP32 board: changes needed

[alphaville]

The following changes are needed on the ESP32 board:

• We need to correct the dimensions of ESP32 (now it is too narrow)
• Add four pull-down resistors at the ESC signals
• Proposal: connect the buzzer both to the ESP32 and the Pi using diodes

[jamie-54]

@alphaville this can be closed?

[alphaville]

Yes, I'm closing it now.