Adds Useful Utilities note.

src/content/notes/NixOS/Useful Utilities.md

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+---
+title: Useful Utilities
+---
+
+Here's a small collection of various utilities and recipes I find useful. It's not organized in a particular way, but more as a long-term memory for me.
+
+## JPEG Optimization
+
+[jpegoptim](https://github.com/tjko/jpegoptim) is a handy little utility for doing JPEG optimization. I use it to compress files and strip EXIF data. Here's an example that will process all the files in the current directory and compress them to a reasonable 85.
+
+```bash
+nix run 'nixpkgs#jpegoptim' -- --max=85 --strip-all *.jpg
+```