code: func (p *Project) Config() (string, error) {
  	cfg := ExportedConfig{
  		Version:  "2.0",
  		Services: p.ServiceConfigs.All(),
  		Volumes:  p.VolumeConfigs,
  		Networks: p.NetworkConfigs,
  	}
  
  	bytes, err := yaml.Marshal(cfg)
  	return string(bytes), err
  }
docs: // Config validates and print the compose file.