deployment

1. git checkout gh-pages
2. git pull origin main
3. npm run build
4. git subtree push --prefix dist origin gh-pages
5. Go to https://github.com/guanw/sr.
6. Click on Settings.
7. Scroll down to the Pages section.
8. Under Source, select gh-pages branch.
9. Click Save.
10. Access the game at https://guanw.github.io/sr/