macOS defaults: a list of macOS defaults commands with demos

A bit sad it's always the same defaults than everywhere else.

When I setup a new system, I always end up here: https://github.com/mathiasbynens/dotfiles/blob/master/.macos

Then I add the few missing ones as I use the machine, like this one for example: https://macos-defaults.com/finder/showwindowtitlebaricons.ht...