fix: refeactor electric pair

It's a built-in package, so we can provide a proper configuration
section using use-package.

config.org

@@ -696,8 +696,12 @@ https://github.com/victorhge/iedit
 #+END_SRC
 
 ** Electric pair
+
 #+BEGIN_SRC emacs-lisp
-(add-hook 'prog-mode-hook 'electric-pair-mode)
+(use-package elec-pair
+  :ensure nil
+  :defer t
+  :hook (prog-mode-hook . electric-pair-mode))
 #+END_SRC
 
 ** Eglot