Migrate references from archived gnome wiki

[Tbusk]

https://pad.gnome.org/wiki-migration-guide#

Since October 23, 2024, the GNOME Wiki was archived. There are some content linked to it throughout the documentation that should either get ported over or alternative links to be found to keep information up to date and usable.

Examples (not all inclusive):
https://docs.vala.dev/developer-guides/gee-samples.html
https://docs.vala.dev/developer-guides/bindings/writing-a-vapi-manually/03-00-using-auto-memory-management/03-03-the-concept-of-ownership-in-vala.html#_3-3-the-concept-of-ownership-in-vala
https://docs.vala.dev/contributor-guide/#submitting-patches