Create a separate page for org-ref citations in the manual

doc/ox-hugo-manual.org

@@ -2565,19 +2565,21 @@ be fixed.
 (Of course, open an issue whenever any ~ox-hugo~ export does not do
 things as you expect :smile:)
 *** Org-ref Citations
-
+:PROPERTIES:
+:EXPORT_FILE_NAME: org-ref-citations
+:END:
 [[https://github.com/jkitchin/org-ref][Org-ref]] citations can be exported to Hugo-compatible markdown via the
 [[https://github.com/andras-simonyi/citeproc-org][citeproc-org]] package. To enable this, simply install ~citeproc-org~
 from MELPA, and run the setup hook. With ~use-package~, this looks
 like:
 
-#+BEGIN_SRC emacs-lisp
+#+begin_src emacs-lisp
 (use-package citeproc-org
   :ensure t
   :after ox-hugo
   :config
   (citeproc-org-setup))
-#+END_SRC
+#+end_src
 
 *** Custom Front-matter Parameters
 :PROPERTIES: