rj-rayat/MERNB1C21 ? reverse-engineered prompt

Build me a simple clean website with a main home page and a second page for GitHub related content. I want it to feel modern and easy to use, with a nice layout, a bit of interactivity, and working navigation between the pages. Use plain JavaScript for any buttons, form behavior, or small dynamic pieces, and make sure the pages look good on mobile too.

If there are any missing details, make reasonable choices and keep it polished. Please wire up anything that needs basic behavior like deleting or updating content so it actually works instead of just looking nice. If you need current details for anything, look up the latest docs online.