configs/default.json errors

[philliphall]

New guy here, trying my amateur best to contribute. Happy to be quiet if not helpful...

I built my first config off of configs/default.json from the repo. Unfortunately, it doesn't specify "overrides": "", (among other things), which causes dactyl_manuform.py to error out at line 118:
if data["overrides"] not in [None, ""]:

Noting that src/run_config.json appeard to be much more current, I recommend option 1) EASY - removing default.json, or option 2) PREFERRED - move src/run_config.json to configs/default.json and configure lines 112-114 to pull from that location instead.

Also recommend updating line 118 to if "overrides" in data and data["overrides"] not in [None, ""]: - because if there is any parameter that shouldn't have to be declared, it's overrides :-)