feat: nixvim refactor

modules/home-manager/programs/nixvim/presets/languages/shell.nix

@@ -0,0 +1,22 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+let
+  cfg = config.presets.languages.shell;
+in
+{
+  options.presets.languages.shell = {
+    enable = lib.mkEnableOption "Shell/Bash";
+  };
+
+  config = lib.mkIf cfg.enable {
+    plugins = {
+      conform-nvim.formattersByFt.sh = [ "shfmt" ];
+      lsp.servers.bashls.enable = true;
+    };
+    extraPackages = [ pkgs.shfmt ];
+  };
+}