Doesn't find config file if no flags are passed

[karlbrown-va]

Linkinator 6.0.4 doesn't find my config file. It's in the current working directory at the top of my source tree. It does work if I pass with --config option.

I think it's due to these lines in config.ts

	if (flags.config) {
		config = await parseConfigFile(configPath);
	}

as such it will only read the config file if flags are passed in.