public static Configuration getBuiltin() {
		String res = "classpath:/" + JBANG_CONFIG_PROPS;
		ResourceRef cfgRef = ResourceRef.forResource(res);
		if (cfgRef != null) {
			Configuration cfg = read(cfgRef);
			cfg.storeRef = cfgRef;
			return cfg;
		} else {
			return new Configuration();
		}
	}
Returns a Config containing all the settings from local config files merged
into one. This follows the system where settings that are "nearest" have
priority. The Config starts out with all the values from `defaults`, any
values read from files have priority.

@return a Configuration object
src/main/java/dev/jbang/Configuration.java