You can add a button with the following hyperlink:
javascript:window.print();
If you want it to have it appear on all pages, put the button on a master page.
Printing all pages will depend on the format.
Continuous Scroll should do this without modification.
To print all pages of a different page format, you may need to attach custom CSS.
This article might help with that: https://www.lynda.com/articles/how-to-print-a-web-page
Note that the multi-file format(s) won't let you print all pages (since only one page is loaded at a time).
In that case, you may want to hyperlink to a printable PDF. You can attach the PDF in a resources folder and create a relative hyperlink (e.g., assets/resources/filename.pdf).
