OmniWM settings written to $XDG_CONFIG_HOME/omniwm/settings.toml.
Either a path to a TOML file or an attrset that will be serialized to TOML. The path form is useful when the file is managed as a template (e.g. in a dotfiles repository), since OmniWM rewrites this file from its GUI and replaces symlinks with regular files.
See https://github.com/BarutSRB/OmniWM for configuration details.