Disable github pages (#588)

Author: bchapuis

.asf.yaml

@@ -30,7 +30,9 @@ github:
     squash: true
     merge: false
     rebase: false
-  protected_branches: ~
+  ghp_branch: ~
+  ghp_path: gh-pages
+  protected_branches: /
 
 notifications:
   commits:      [email protected]