install emacs packages via nix instead of use-package

modules/home/programs/emacs.nix

@@ -4,6 +4,15 @@
     programs.emacs = {
       enable = true;
       package = pkgs.emacs-pgtk;
+      extraPackages =
+        epkgs: with epkgs; [
+          eldoc-box
+          elisp-autofmt
+          corfu
+          cape
+          nix-mode
+          envrc
+        ];
       extraConfig = ''
                           ;; -*- lexical-binding: t; -*-
         (setq make-backup-files nil)
@@ -14,25 +23,22 @@
                        "https://snapshots.melpa.org/packages/")
                      t)
         ;; add packages
-        (use-package org-view-mode :ensure t)
-        (use-package envrc :ensure t)
+        (use-package org-view-mode)
+        (use-package envrc)
           
-        (use-package nix-mode :ensure t)
+        (use-package nix-mode)
         (use-package
           eldoc-box
-          :ensure t
           :hook (eglot-managed-mode . eldoc-box-hover-mode)
          )
         (use-package
          elisp-autofmt
-         :ensure t
          :commands (elisp-autofmt-buffer elisp-autofmt-mode)
          :hook (emacs-lisp-mode . elisp-autofmt-mode)
          :config)
         (use-package portage-modes :ensure t)
         (use-package
          corfu
-         :ensure t
          :init
          (setq
           corfu-auto t
@@ -43,7 +49,6 @@
         (setq tab-always-indent 'complete)
         (use-package
          cape
-         :ensure t
          :bind ("C-c p" . cape-prefix-map) ;; Alternative key: M-<tab>, M-p, M-+
          :init (add-hook 'completion-at-point-functions #'cape-file))
         (setq corfu-auto-prefix 2)