* docs: update instructions for development flow * feat: add devenv profile for nix/devenv environment setup * chore: update .gitignore to ignore stage-tamagotchi-tauri fonts * docs: add instructions to use devenv * docs: fix note asides * fix: missing bracket * chore: ignore devenv related files * chore: update ignore pattern * chore: update .gitignore to include a newline at the end --------- Co-authored-by: 藍+85CD <50108258+kwaa@users.noreply.github.com>