Actions to take after repository migration is complete (#8394)

* Change project URL from robbyrussell to ohmyzsh org

* Update git remote to use ohmyzsh org repository

tools/upgrade.sh

@@ -31,6 +31,12 @@ git config fsck.zeroPaddedFilemode ignore
 git config fetch.fsck.zeroPaddedFilemode ignore
 git config receive.fsck.zeroPaddedFilemode ignore
 
+# Update upstream remote to ohmyzsh org
+remote=$(git remote -v | awk '/https:\/\/github\.com\/robbyrussell\/oh-my-zsh\.git/{ print $1; exit }')
+if [[ -n "$remote" ]]; then
+  git remote set-url "$remote" "https://github.com/ohmyzsh/ohmyzsh.git"
+fi
+
 printf "${BLUE}%s${NORMAL}\n" "Updating Oh My Zsh"
 if git pull --rebase --stat origin master
 then