public static String getStableID(File backingFile) {
		try {
			return getStableID(readString(backingFile.toPath()));
		} catch (IOException e) {
			throw new ExitException(BaseCommand.EXIT_GENERIC_ERROR, e);
		}
	}
Takes common patterns and return "parent" urls that are meaningfull to trust.
i.e. github.com/maxandersen/myproject/myfile.java will offer to trust the
github.com/maxandersen/myproject project.

@param url
@return
src/main/java/dev/jbang/util/Util.java