In the theory chapter, no image displays correctly. This is because the paths are wrong, instead of "//pijul.org/img/*" they should point to "//pijul.org/manual/*".

If you want to read the manual in the meantime, you can paste this into your browser JavaScript console:

for (const img of document.getElementsByTagName("img")) { img.src = img.src.replace("/img/", "/manual/") }

I just applied this patch, thanks!