This is a neat theme and site. I have a a google doc called “unix commands” that I just add stuff onto. It started as a text file in my home directory 30 years ago and has grown to pretty much any snippet of code. I control+F to find stuff and that works ok. I’m not sure the level of effort to reformat to this theme would pay off in benefits of easier search and reuse.
All notes in my theme are essentially markdown, so you'd have to convert what you've got. There would be an up front cost, but I think that the benefit might be worth it. Having said that, as you can see by the discussion on this thread, each person has their own preference for how they keep notes.