Update _config.yml

Author: murphyqm

book/_config.yml

@@ -34,7 +34,7 @@ launch_buttons:
   thebelab                  : false  # Add a thebelab button to pages (requires the repository to run on Binder)
 
 repository:
-  url                       : https://github.com/arcdocs/hpc1  # The URL to your book's repository
+  url                       : https://github.com/ARCTraining/hpc1/  # The URL to your book's repository
   path_to_book              : "book/"  # A path to your book's folder, relative to the repository root.
   branch                    : gh-pages  # Which branch of the repository should be used when creating links