to use the new resources syntax
I also reordered the sections to cover all the resource API first before covering the spawn API
I've also added a section about the old `static mut` variable transform
479: book: detail import resolving for 0.6 migration r=korken89 a=tmplt
That is, answering the question of why imports are no longer resolving during compilation.
Co-authored-by: Viktor Sonesten <v@tmplt.dev>