Re-direct homepage to Worg.

* lisp/ob-lilypond.el:
 Re-direct homepage to Worg.

lisp/ob-lilypond.el

@@ -4,7 +4,7 @@
 
 ;; Author: Martyn Jago
 ;; Keywords: babel language, literate programming
-;; Homepage: https://github.com/mjago/ob-lilypond
+;; Homepage: http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-lilypond.html
 
 ;; This file is part of GNU Emacs.