One way using Safari. You can save the whole web page in PDF format and save it directly to a new note or append it to an existing one. Just press the share button, then options at the top of the dialogue window, choose PDF and ok, then the notes icon, you can choose an existing note or create a new one, add some text and hit ok. That’s it. Hope it helps you. If the webpage allows you to select reader version you can also choose PDF reader and you’ll get a much cleaner version of it. I just have an iPhone, but I know you’ll be able to do it in a Mac too.