Add ediff config.

By default ediff shows a ugly floating window.
With this config we improve a lot that default behaviour.

configs/init-packages.el

@@ -97,6 +97,16 @@
         doom-modeline-indent-info nil
         doom-modeline-persp-name t))
 
+;; Resolver diferencias entre 2 archivos o versiones del mismo.
+(use-package ediff
+  :defer t
+  :ensure nil
+  :config
+  (setq ediff-diff-options "")
+  (setq ediff-custom-diff-options "-u")
+  (setq ediff-window-setup-function 'ediff-setup-windows-plain)
+  (setq ediff-split-window-function 'split-window-vertically))
+
 ;; Emparejamiento automático de comillas, paréntesis, corchetes y llaves
 (use-package electric-pair
   :defer t