So a personal website with a personal blog is ok then.
Curious though how it handles a surge in requests, like from being on the front-page of HN. But many open source projects host their doc pages with Github pages and some of those get a lot of traffic so I'm sure that it's not an issue
The "front page of HN" has not scaled like the rest of the computing hardware has scaled. The smallest VM you can get serving static content will yawn at the full power of an HN surge. Unless you have a very 200x-era bandwidth limit, or you're trying to be on the front page of HN with a 250MB web page (which does happen), it's not anything to be concerned about anymore.
GitHub Pages runs everything through a Fastly CDN. You can tell like this:
I get this: The x-fastly-request-id is the giveaway.