I updated the CSS to have it more modern (flat design).
It seems there is a pb on kapidox in src/kapidox/data/templates/fwinfo.html
I had to comment this command: {% if fwinfo.maintainers|count != 0 %}s{% endif %}
You can compare with the current version on http://api.kde.org/frameworks-api/frameworks5-apidocs/
Here are some screenshots:
Index page:
When you pick a class:
Prototypes in a class:
Code overview (only changed the height of line: it's more comfortable to read I think):