isocpp/CppCoreGuidelines ? reverse-engineered prompt

Build me a clean documentation website for the C++ Core Guidelines that makes the guidelines easy to read and browse online.

I want the site to feel simple, fast, and professional, with a home page, a clear way to open the full guidelines, and a browsable layout for the different sections and rules. Keep the content mostly in plain Markdown so it’s easy to maintain, and make sure the site works well on desktop and mobile. It should look like a serious reference site, not a marketing page.

Please include a polished landing page, navigation, and the basic structure needed to publish the guidelines online. If anything about the current setup is unclear, look up the current docs online and match the existing project style as closely as possible. Also make sure the pages are easy to update later, since this is meant to be a living document.