Add support for displaying license in book title block

[dragonstyle]

Discussed in #4792

^{Originally posted by franzeder March 13, 2023}
How can I add a licence (e.g., CC BY-NC) to a quarto book?

I would like to print this licence (maybe including the respective figures) at my Quarto Book Website (https://www.politik-wissenschaft.at/) next to the DOI.

How can I do that?