During development, we should develop index.html in the src folder. Per the original readme, we should type gulp in terminal to display the html in browser.
After development, we should run sh deploy.sh to minify webpage and deploy index.html to the root. How to know it is minified successfully? We can check whether it can be previewed via the side of vscode. However, note that a few components might be not perfect, as the best display is always via the browser.