Dear Maintainer,

i just installed libglm-doc to read on GLM, but unfortunately the
doxygen generated page seems to be missing the interesting parts...

Opening up `/usr/share/doc/libglm-doc/api/index.html` I see (besides
some JS artifacts about "loading" and "searching"), three relevant
links:
- Website: https://glm.g-truc.net/
- GLM API documentation: file:///usr/share/doc/libglm-doc/api/modules.html
- GLM Manual: https://github.com/g-truc/glm/blob/master/manual.md

so two of these links go to the external upstream homepage, which is
fine, but I want to read the documentation locally.
the 3rd link points to file:///usr/share/doc/libglm-doc/api/modules.html
which... does not exist.


the nice thing about doxygen generated docs is, that they give you a
navigable structure.
this is not the case here, as the entry point to the API documentation does not work.

there's a total of 738 files in /usr/share/doc/libglm-doc/api/, which
makes it a bit... hard to find relevant information (if there's no entry
point)


thanks for fixing this :-)