Prusa i3 Bltouch Upgrade

### Description
The 3dprintingstore.co.za Prusa i3 uses a micro switch on a servo with the auto bed-leveling upgrade kit. I really like the auto bed leveling feature but never really trusted the repeatability of the switch on the servo.

This is an upgrade to replace the servo mounted micro switch with a bltouch sensor. Wiring of the Bltouch is great, you directly replace the servo and z end stop connectors with the matching cables on the Bltouch. Reference the attached image.

I included