simplify Configuration

[17Halbe]

What about moving all configuration options into an .env file?
This is the docker-compose way of configuring environmental variables anyway. See env-file

Benefits would be:

• The user wouldn't have to mess around in the compose file itself which we in turn wouldn't have to debug. 👍
• It's backward compatible: If one uses his old docker-compose file nothing would change.
• We could explain each variable in the config (.env) file itself.

Sounds cool?

[johansmitsnl]

Users can use both at the same time. It could definitely be mentioned in the readme page with a example to.