It's a pelican static site but in git; then there is a tiny Python webserver that 'publishes' the bare git repo, not unlike a custom github pages.
And it's running on an absolute-cheapest VPS with no RAM or CPU to speak of.
The good thing about the host though is they limit bandwidth rather than total bytes, so sure it slows down - it's really being hammered right now! - but it won't die with a nasty message when it hits some total-bytes-per-month limit.