Revert "update submodule upon website rebuild"

This reverts commit 21aced8.

Author: soumith

scripts/deploy-site.sh

@@ -29,11 +29,6 @@ else
     git checkout --orphan master
 fi
 
-# Update submodule pytorch/hub to the latest master branch
-# Then copy over images to assets/images
-git submodule update --remote _hub
-cp _hub/images/* assets/images
-
 cd "../"
 make build_deploy
 cd master-branch