Render API documentation on the website

[fsimonis]

We should render the API on the website including bindings:

Language	Status	How
C++	done	Doxygen
C	done	Doxygen
Fortran (C implementation)	bad	Doxygen as C functions, Fortran module not available
Fortran Module	missing	Could document using doxygen, but C counterparts not available.
Python	missing	via sphinx (autodoc for cython)
Rust	missing	via cargo rustdoc
Julia	missing
Matlab	missing

[MakisH]

Trying to fill the boxes with some additional search:

• For Julia, there seems to be Documenter.jl with some examples.
• For Matlab, there seems to be a Sphinx extension. Note that the MATLAB bindings also use C++ as a bridge.