add shfmt and shellcheck to system-wide neovim packages

modules/darwin/dotfiles.nix

@@ -13,9 +13,8 @@
             if test "$argv[1]" = "offline"
                 set option "--option substitute false"
             end
-            pushd ${config.dotfilesPath}
-            git add --all
-            popd
+            commandline -r "git -C ${config.dotfilesPath} add --all"
+            commandline -f execute
             commandline -r "darwin-rebuild switch $option --flake ${config.dotfilesPath}#macbook"
             commandline -f execute
           '';

modules/editor/neovim/default.nix

@@ -5,6 +5,8 @@
     home.packages = with pkgs; [
       neovim
       gcc # for tree-sitter
+      shfmt # used everywhere
+      shellcheck # used everywhere
     ];
 
     xdg.configFile = {