Create tray.md

src/content/docs/macos/tray.md

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+---
+title: Tray in macOS
+description: Useful apps, settings, and quality of life
+---
+
+## Tray items spacing
+
+Reduce spacing between icons / items in tray:
+
+```
+defaults -currentHost write -globalDomain NSStatusItemSpacing -int 8
+```
+
+Here is how the setting of `8` looks like:
+
+TBD
+
+:::note
+Requires a logout or a restart to take effect
+:::