feat: define targets in client flake.nix

feat: add flake.nix for client

feat(client): impl api calls for game endpoints

feat(client): update user requests to use macros

feat(client): add macros for http requests

feat(client): init browse view

fix(client): register should take to login

feat(client): functional login and register

feat: basic login and register windows

feat: init menu

feat: init bevy

docs: add licence template to main.rs

chore: new client, keep old for a while