Add ox-groff

uno/modules/doc/org.org

@@ -55,6 +55,11 @@ Define Org document package.
     :config
     (require 'ox-beamer))
 
+  (use-package org-contrib
+    :after (uno-doc-org org)
+    :config
+    (require 'ox-groff))
+
   (use-package org-superstar
     :if (display-graphic-p)
     :after (uno-doc-org org)