Ask HN: What do you use to write technical documentation?

By technical doc, I mean server infrastructure, services, network and code (but feel free to extend the discussion to something else if that's your specialty). I'm using a mixture of asciidoc and markdown. I like being able to have diagrams from code in my document (mermaid, plantuml...) Currently I'm using IntelliJ for that but I wish I would have something more adapted to documentation. Do you have any recommendations? I'm also interested in things related to technical documentation in general (good practices,...)