Delete trailing whitespaces before-saving

Enable globally because I don't know of a scenario where we would ever
want this.

config_new.org

@@ -57,6 +57,12 @@
 
 * General config
 
+** Delete trailing whitespaces
+
+#+BEGIN_SRC emacs-lisp
+(add-hook 'before-save-hook 'delete-trailing-whitespace)
+#+END_SRC
+
 ** Save history and recent files
 
 #+begin_src emacs-lisp
@@ -373,5 +379,3 @@ https://github.com/remyferre/comment-dwim-2
     (define-key projectile-mode-map (kbd "C-x p") 'projectile-command-map)
     (projectile-mode +1)
 )
-
-#+END_SRC