Is your feature request related to a problem? Please describe.
Despite fjira being so awesome 😉, it keeps cluttering my $HOME dir with its cofig dir.

Describe the solution you'd like
Using $XDG_CONFIG_HOME env var would make more sense.

Describe alternatives you've considered
N/A

Additional context
Spec docs: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html