Feat: implement `remove_item_from_list/3` function

[nelsonic]

As outlined in https://github.com/dwyl/mvp/issues/420 we already have a simple way to add an item to a list: https://github.com/dwyl/mvp/blob/b8aee0e3c29d0cb45025595131248c08fbbf6a31/lib/app/list.ex#L149-L154

need a way of removing an item from the list so that we can easily move the item to a different list.

Todo

• [x] Write tests for remove_item_from_list/3 🧪
• [x] Implement remove_item_from_list/3 function to pass tests 🧑‍💻
• [x] Document it with examples in /book 📘
• [x] Ship. :shipit:

[nelsonic]

Quick side-quest: https://github.com/dwyl/useful/issues/55

[nelsonic]

https://hexdocs.pm/useful/1.13.1/Useful.html#remove_item_from_list/2 📦 :shipit:

[nelsonic]

Easy: https://github.com/dwyl/mvp/blob/f212cd541ed21d294e1f8171bc966a6d716bfd56/lib/app/list.ex#L188-L198

Documented in: mvp/19-add-item-to-list.md#remove-item-from-list

Published at: https://dwyl.github.io/book/mvp/19-add-item-to-list.html

[nelsonic]

Included in https://github.com/dwyl/mvp/pull/165 :shipit: