google/web-starter-kit ? reverse-engineered prompt

Build me a web starter project for a responsive site that works well on phones, tablets, and desktop. I want a clean homepage to start from, with a Material Design style option and a very simple basic option too, so I can choose whichever fits my project.

Please include a smooth local workflow for editing, previewing, and refreshing the browser as I make changes, plus support for Sass and modern JavaScript if needed. When I’m ready to publish, it should create a production build that minifies and optimizes the HTML, CSS, JavaScript, and images so the site stays fast.

It would also be great if the setup includes offline support for the final build, and keeps performance best practices in mind from the start. Make it easy to run and easy to customize, and if you need to check anything about current build or browser support details, look up the latest docs online.