* Change authorization header key
as the use of headers starting with X- has been deprecated in RFC6648.
* Update configuration.example.yaml
Co-authored-by: Sebastian Serth <MrSerth@users.noreply.github.com>
We previously didn't really had any structure in our project apart
from creating a new folder for each package in our project root.
Now that we have accumulated some packages, we use the well-known
Golang project layout in order to clearly communicate our intent
with packages. See https://github.com/golang-standards/project-layout
