The script used to identify and update the change is added into the GitHub
workflows script directory. A workflow action can be created to trigger the
script to update the headers on the first of every new year. Possibly a task for
a consequent PR.
The purpose config was declared by using user mode purposes
which are reserved for user configuration.
I have also fixed the license header for config.el which did
not mention Sylvain Benner & Contributors.
