- move all of mackup's config files into $XDG_CONFIG_HOME/mackup:
+ ~/.mackup.cfg => configs for mackup itself
+ ~/.mackup/*.cfg => custom sync rules applied by mackup
- add automatic installation of `pipx` and `mackup` during the
setup of the dotfiles
+ `pipx`'s config is moved into $XDG_CONFIG_HOME
+ `mackup`s config locations are adapted via a "little hack"