Modern applications must use the following paths to store configuration files:
- $XDG_CONFIG_HOME/hg/hgrc,
- $HOME/.config/hg/hgrc (if XDG_CONFIG_HOME is unset or not absolute).
For backward compatibility, ~/.hgrc is still created if no hgrc exist using hg
config --edit.
See https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
