Oh, looks interesting, lets check out the architecture documentation! searching.... Ah, found it: Makefile and manual.tex... Yeah, f off :)
Out of curiosity, what would you prefer? I wouldn't say tex is my all time favorite format, but definitely better than 90% of the documentation solutions out there.
While I agree that repos with docs should have "releases", in GitHub parlances, with compiled PDFs/ebooks/whatever, building it yourself is as simple as
The future is now, old man.