Hypercube BLTouch Mount

This is a remix of the capacitive proximity sensor mount into a BLTouch mount. It should hold the sensor (not including the pin) 8.3 mm above the print bed when the nozzle is on the bed.

In your Marlin config, start with NOZZLE_TO_PROBE_OFFSET set to {25,0,-2}, home the printer, get the Z position (probably greater than 0) where a piece of paper drags a bit when pulled between the nozzle and bed, and add that to -2 to get the proper Z-value for probe offset