Documentation for bindings

It would be great if Biblioteca would provide binding specific documentation for at least Vala, GJS, PyGObject and gtk-rs.
In the simplest form it could do that by having links from all pages to the respective counterpart in these docs.

Biblioteca could also bundle offline versions of these if licensing allows.

Example for where Gtk-4.0's "GtkSwitch.set_active" would link to:

• Vala: https://valadoc.org/gtk4/Gtk.Switch.set_active.html
• GJS: https://gjs-docs.gnome.org/gtk40~4.0/gtk.switch#method-set_active
• PyGObject: https://lazka.github.io/pgi-docs/Gtk-4.0/classes/Switch.html#Gtk.Switch.set_active
• gtk-rs: https://gtk-rs.org/gtk4-rs/git/docs/gtk4/struct.Switch.html#method.set_active (this is probably the most complicated to link to, due to the different crates involved and structural differences / extension traits)

Related issues:

• #27 - would be required for properly displaying the content, especially if loaded from online sources
• #47 - such an API/URI schema could also support direcly loading the binding specific pages

Start by reviewing related issues #27 and #47, then compare the example links for Gtk-4.0's GtkSwitch.set_active across Vala, GJS, PyGObject, and gtk-rs. Done would provide binding-specific links from Biblioteca's pages, with optional offline documentation considered only where licensing permits.