API-Reference is missing

[Peter Weber <peter weber mailbox org>]

Hello!

The list of API-References regarding C++[1] is outdated and links to an empty page, also changing it to 3.24 
doesn't help either:
https://developer.gnome.org/gtkmm/3.22/
https://developer.gnome.org/gtkmm/3.24/

The last one working is:
https://developer.gnome.org/gtkmm/3.20/
The current development version is neither working, but the other two development versions are working.

Who can create API-Reference for 3.24? The links to other library refernces, are also not in good condition. 
Can I help maybe?

Thank you

[1] https://developer.gnome.org/references#c++-bindings