systemdesign42/system-design-academy — reverse-engineered prompt

Build me a clean System Design Academy website from this repo. The current project is basically a curated README of links, so turn it into a simple, polished learning hub for people preparing for system design interviews.

I want the homepage to clearly explain that this is a free collection of system design case studies, fundamentals, interview prep, AI engineering articles, and software white papers. Add a strong newsletter join button near the top and bottom using the existing newsletter link.

Make the content easy to browse. Group links by the same sections from the README, add A to Z filtering where it makes sense, and include a search box so someone can quickly find topics like Instagram, Postgres, AWS, real time comments, or caching. Each article should show a readable title and open the original link.

Keep it fast, mobile friendly, and simple to maintain. Use the README as the source of truth for the content if possible. Look up current docs online if you need to.