Add treefmt and fill out devshell with Rust stuff - #2

Add treefmt and fill out devshell with Rust stuff#2

MagicRB wants to merge 1 commit into

mainnumtide/nix-relay:mainfrom

feat/formatter-and-devshellnumtide/nix-relay:feat/formatter-and-devshellCopy head branch name to clipboard