Doc: Make zipped HTML download contain individual pages, not a single page
Feature description
As noted by @jidanni in https://github.com/OSGeo/gdal/issues/12093#issuecomment-2792620207 , the zipped HTML download contains all of the documentation in a single HTML page.
This seems be an intended behavior for ReadTheDocs (https://stackoverflow.com/questions/32771287/download-html-as-separate-pages). Perhaps we can work around it somehow.
Additional context
No response
The funny thing is that you offer two zips there on gdal.org, the multiple pages one that I want, and the single page one that I don't want.
The problem is the multiple pages one is old, and the single pages one is new.
I'm hoping for a multiple pages one that is new. (Reflects the bleeding edge version.)
As far as the web addresses of each, etc. I believe this bug report is getting confusing enough already...
The single page behavior is also documented in https://docs.readthedocs.com/platform/stable/downloadable-documentation.html.