Make site easier to read when JS is disabled

[BjarniRunar]

Comment from Hacker News:

"Meta comment: the website is mostly unreadable with JS disabled because the fixed-position head is covering most of the page, but fine when removing the "position: fixed" from the "navigation" class. (And your target audience will generally be one that prefers to have JS off, I'd think.)"

(https://news.ycombinator.com/item?id=8649772)