doc: MacOS setup guide

README-MacOS.org

@@ -1,10 +1,27 @@
-# Desktop Environment for MacOS
+# Configuration for MacOS
 
 * Installation
 
-Install Homebrew.
+Install
+- [[https://brew.sh/][Homebrew]]
+- [[https://lix.systems/install/][Lix]]
 
-* Desktop Manager
+and use ~nix-darwin~ to install the system flake
+#+begin_src sh
+nix run nix-darwin -- switch --flake ~/.config/nix-darwin
+#+end_src
+
+To update the system after flake changes,
+#+begin_src sh
+darwin-rebuild switch --flake .
+#+end_src
+
+Optionally, run
+#+begin_src
+nix-collect-garbage --delete-old
+#+end_src
+
+* Desktop Environment
 
 - [[https://github.com/koekeishiya/yabai][yabai]]: Window manager, see [[https://github.com/koekeishiya/yabai/wiki][setup guide]]
 
@@ -18,7 +35,4 @@ Install Homebrew.
  ~fn~ key is used as the workspace leader key and ~cmd~ key is used as window
   leader key. The reason is that ~fn~ and arrow key combinations disable arrow
   keys for other applications.
-- ~Karabiner-elements~: Install and remap Caps Lock to Meh key. This is the
+- Sketchybar: Status Bar
-  master key for window operations in ~yabai~.
-- [[https://github.com/felixhageloh/uebersicht][Uebersicht]]: Widgets manager
-- [[https://github.com/Jean-Tinland/simple-bar][simple-bar]]: Status bar (see page for installation guide)