The old design (before #205) used to feature a tutorial for GTK 3 users, including instructions for cross-compilation and various other details about how Rust wraps GTK.

This tutorial is referenced from various places, like the GTK 3 crate README for example (https://crates.io/crates/gtk), this link being currently broken.

Since GTK 4 isn't released, and the online book mentioned on the homepage doesn't cover the same topics, shouldn't the tutorial be kept online until new resources cover the same subjects or more?

Link to the old tutorial in case people visiting this issue need it: https://github.com/gtk-rs/gtk-rs.github.io/tree/617a9f8fb44f7fb0d338b4a6f4703815e7ea66a0/docs-src/tutorial