I did something similar, back in the day. I setup debian-administration.org at least partly to document things I'd learned, tried, or discovered.

It was a useful resource for a few years, but it never really took off and I had the pain of dealing with spam and user-support. So now the site is read-only archive-only, and offline.

But it was a good experience. Forcing myself to document things "nicely" really helped make sure I learned things and didn't need to refer back to my own notes in the future.