PanXProject/awesome-certificates ? reverse-engineered prompt

Build me a simple, polished website for this curated list of free courses with certificates and digital badges.

It should let people browse the courses by topic like AI, business, design, cloud, security, and programming, and quickly see the course name, provider, difficulty, duration, and whether they get a badge or a certificate. I want it to feel easy to scan on mobile and desktop, with a clean homepage, category navigation, and a way to search or filter the list so someone can find something fast.

Please also include a clear page or section that explains how to contribute a new course, plus links for reporting a problem or requesting a certificate. Keep the content friendly and community focused, and make sure the design works well with a long list of entries. If you need to check current docs or best practices, look them up online.