google/styleguide ? reverse-engineered prompt

Build me a clean documentation site for Google style guides that works well on GitHub Pages. I want a simple homepage that explains what the style guides are, then easy to browse pages for each language guide like C++, Java, Python, JavaScript, TypeScript, HTML and CSS, JSON, Shell, and the others in the repo.

Make it feel like a real reference site, with clear navigation, readable typography, and code examples that are easy to scan. Keep the layout responsive so it looks good on desktop and mobile, and include the usual legal and support pages like the code of conduct and a nice 404 page. If anything about the current docs or publishing setup is unclear, look up the current docs online and keep the implementation aligned with how GitHub Pages sites are usually built.