Chapter 4.8 has many issues with ordering of information

- [ ] no mention of the fact that one needs to add regex crate to Cargo.toml (this will catch out people less experienced in Rust)
- [ ] weapons with hit dice are introduced a long way before the combat system catches up (it only does so after we've made the Rusty Longsword for your starting inventory)
- [ ] no mention of where the string_to_slot function comes from ... waiit, the function is introduced a long way down the chapter, roughly where the wearables come in
- [ ] find_slot_for_equippable_item is using wearables before the concept is introduced