I'm actually in the middle of rebuilding my entire setup right now and one of my major goals is to actually document my processes this time.

I use Obsidian which is a Markdown editor and I have a couple plugins alongside that for QoL stuff and extra features.

I document processes, problems and fixes I encounter, list of active services alongside where/how to access them, and plans for future additions/changes.

As far as working documentation into your flow, realistically that is just a matter of discipline. It is explicitly up to you to stay on top of documentation.

Hope that helps, and good luck with your endeavor! 😁