print: improve toc generation

[McShelby]

For a full print version it would be great to have the ability to configure the site toc and add page numbers to it

https://www.michaelperrin.fr/blog/2019/11/printing-the-web-part-2-html-and-css-for-printing-books
https://css-tricks.com/a-perfect-table-of-contents-with-html-css/
https://pagedjs.org/documentation/1-the-big-picture/