Fix CLI

[RobinBoers]

Hi! I noticed the CLI was broken, so I fixed it. I also added an optional argument to set the mode (1, 2, 3, -1 etc.) and a simple help menu.

Edit: I also added the style tag to the ones that should be skipped, to prevent stuff like this from being "smartified":

::after {
  content: "yay";
}

[RobinBoers]

I'm not seeing much activity on this repo anymore. Is there anything I can do to get this merged? If not, that is fine too; I completely understand if this was a sideproject that you do not want to actively develop or maintain anymore.

Thanks either way for porting it to JavaScript and publishing it to NPM. I really like the project and it has helped me on countless occasions. So, uhm.. thanks :)