This removes most of the legacy upstream config madness by not using
weird config files spread all over the place.
This isn't the solution to other config reading fragility issues, but
it does move the whole config back to the central airtime.conf file.
This is one of the "small" things I need to take care of on my local env. Once the value is changeable through more than just the config file, I'll won't be touching these in my docker envs as much.