The documentation is lacking an info on how to include outside scripts / styles

[gicolek]

Would you be so kind to add the information on how one can load external scripts the expected way?

For instance scripts that are impossible to be loaded via npm install --save.

One solution to that is simply adding their CDN version to the base.twig file with the defer tag, which will then allow one to use them from app.js.

What are the best and suggested methods for doing so?