It seems to me it would be a good idea if Hrvoje gave one or more Org
maintainer commit access to this repository. Alternatively we could
maintain it at https://github.com/emacsorphanage/htmlize, and I could
take care of giving commit access, but in that case Hrvoje would also
have to get involved briefly at least, to transfer the repository to
that organization.

I'd be fine with transferring commit access to the repo. Writing and maintaining htmlize was much fun, but although I still use Emacs for my day-to-day work, I haven't done any elisp in many years now. At this point it's clear that I won't be getting back to it any time soon, so it's time to pass on the maintainership of htmlize to someone who will take good care of it. Someone from org mode seems like a great choice for that.

Can we discuss the technical details in a separate email thread or ticket?

Kind regards,

Hrvoje