I would also second Hugo which I use for my personal site and blog which I haven’t updated for a long time. Nice thing is that it has a minimal footprint of needing to watch out for updates unlike something like Wordpress which was known for being vulnerable stable if left unmaintained. It’s mostly looking out for old themes with vulnerable javascript.
Another popular options is Jekyll and I honestly can’t remember why I picked Hugo over it but if you don’t need dynamic content, why make things more complex?
How does Okta not have systems like support systems like what was breached with the credentials behind a VPN as well? A system like that really ought to be on a secured network. We have so many systems at work that are VPN required and it’s mostly those where sensitive data lives.