Returns the path to the user's config directory.
Linux: Resolves to $XDG_CONFIG_HOME or $HOME/.config.
$XDG_CONFIG_HOME
$HOME/.config
macOS: Resolves to $HOME/Library/Application Support.
$HOME/Library/Application Support
Windows: Resolves to {FOLDERID_RoamingAppData}.
{FOLDERID_RoamingAppData}
1.0.0