engine: Add guix-isues ("gui"), use Guix Data Service to query packages ("gup").

.emacs.d/lisp/init-engine.el

@@ -73,8 +73,12 @@
   :keybinding "guh"
   :browser 'ambrevar/engine-eww-function)
 
+(defengine guix-issues
+  "https://issues.guix.info/search?query=%s"
+  :keybinding "gui")
+
 (defengine guix-packages
-  "https://guix-hpc.bordeaux.inria.fr/package/%s"
+  "http://data.guix.gnu.org/repository/1/branch/master/package/%s"
   :keybinding "gup")
 
 (defengine imdb