Ask HN: Best headless CMS for a developer portal

I haven't really worked with a CMS since peak WordPress ten-plus years ago. Coming back to this and needing to create a developer portal to document complex API integrations for our clients I am looking for an open-source headless CMS that isn't going to make me pull my hair out. I want to self-host it as I have AWS and Azure available to me at work. Any suggestions for a modern CMS that you enjoyed using?