I love this! I started doing this years ago as well via a simple notes dir in my dotfiles (example [1]), and actually wrote a small tool to help me with it [2]. This way I can list all the note files I have (cli, zsh, vim etc) and pretty print them a bit and have search if I can't remember the exact thing :)

[1]: https://github.com/bittersweet/dotfiles/blob/master/notes/gi...

[2]: https://github.com/bittersweet/notes