[Tutorial] How to get your NanoHatOLED to work

keep two versions of python on the system.
both python2 and python3.

revise:
NOT “\root\NanoHatOLED/BakeBit/Software/Python/bakebit_128_64_oled.py””
it should be "\root\NanoHatOLED/BakeBit/Software/Python/bakebit_nanohat_oled.py”