Collapse multi-language examples
It would be really nice if gi-docgen offered some way to let docs collapse multi-language examples (e.g. a tabbed view), similar in spirit to what sphinx achieves at developer-www (e.g. the examples at https://developer.gnome.org/documentation/tutorials/drag-and-drop.html). Most often people want to look for examples in a concrete language, the alternative choices are showing the examples for different languages consecutively, or sticking to a single language.