GuilhermeLopesMMA/PagesTester ? reverse-engineered prompt

Build me a simple website with a clean homepage and a few linked subpages, so I can use it to test GitHub Pages.

I want it to feel like a small demo site, with a homepage, some basic navigation, a place for text content, and a spot for images or media if needed. Keep it lightweight and easy to edit, with everything working nicely in a browser. If you need to look up anything current, go ahead and check the latest docs online.

Make it look presentable on desktop and mobile, and make sure the links between the pages work correctly.