The new MDN design looks snazzy but no longer works in NetSurf. I would hope a resource like this was highly accessible, even to browsers without CSS3 support (isn't this why we have @supports?). It's also furthering a trope of themes being a binary toggle; there are more options than just white and gray--how about OLED black to conserve the least about of power (looks better on my screens too).
The content of MDN is open at https://github.com/mdn/content, currently a mix of HTML and Markdown but getting transitioned to Markdown. So a different effort could perhaps be made here for a "low-tech" (like CSS2 at most and Javascript-free?) static page generation to live in parallell with the modern pages. It's all neatly organized in a hierarchical structure.