docs: conf.py: Remove an irrelevant TODO
docs: conf.py: Remove an irrelevant TODO

This TODO made sense in the context of the original project, but for use in
CircuitPython it does not appear to be relevant.  Remove it.

adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython