saveCliConfig function
Saves CliConfig to ~/.fah/config.yaml.
Implementation
Future<void> saveCliConfig(String homeDir, CliConfig config) async {
final dir = Directory('$homeDir/.fah');
if (!dir.existsSync()) dir.createSync(recursive: true);
final file = File('${dir.path}/config.yaml');
await file.writeAsString(config.toYaml());
}