doc: Try with system package.

doc/tools/setup.el

@@ -1,18 +1,6 @@
 (require 'org)
 (require 'subr-x)
 
-;; Needed packages
-
-(require 'package)
-(add-to-list 'package-archives
-             '("melpa" . "https://melpa.org/packages/"))
-
-(package-initialize)
-
-;;; Install HTMLIZE
-(package-install 'htmlize)
-(require 'htmlize)
-
 ;; LaTeX config
 
 (add-to-list