[Feature Request] Move auth functions from hard coded files to .env file

[bdf0506]

Description

Now that the app supports the use of the .env file instead of config.ini, the auth parameters should also be moved to that file. This will limit the places that someone needs to update when setting up a deployment and overall simplify the configuration of the app.

[uberfastman]

Great idea... it would be nice to just do away with all of the separate auth files (for the various platforms and integrations) and just have them all in the settings pulled from the environment vars/.env file. I'll look into this pivot soon.