The documentation index that we have on https://docs.yoctoproject.org/genindex.html# is empty in the mega manual: https://docs.yoctoproject.org/singleindex.html#document-genindex
Unfortunately, this is an open issue in Sphinx: https://github.com/sphinx-doc/sphinx/issues/3631 I tried the solution proposed in http://fnch.users.sourceforge.net/sphinxindexinsinglehtml.html, but couldn't get it to work. Unless we implement a fix in upstream Sphinx, but I'm not sure it's a big value for us as the megamanual is not the most used form of the manual.
Still facing this issue with Sphinx 6.2.1.
Bulk move from 4.99 or 0.00 to 5.99
Still facing this issue with Sphinx 8.1.3.