Cleanup workflow file

Author: simonsan

.github/workflows/gh-pages.yml

@@ -51,12 +51,3 @@ jobs:
           git config --global user.name "GH Actions Runner"
           chmod u+x ci/ghpages-deploy.sh
           ./ci/ghpages-deploy.sh
-
-# git branch gh-pages
-# sed -i 's/book/#book/' .gitignore
-# rm book/.nojekyll
-# git add book/
-# git commit -am "MDBook Deployment"
-# git subtree split -P book -b gh-pages
-# git checkout gh-pages
-# git push -f https://github.com/simonsan/std-dev-guide gh-pages:gh-pages