refactor: use michaotic username throughout, add cli/kitty/zsh configs and docs

hosts/poppy/default.nix

@@ -13,15 +13,25 @@
     "flakes"
   ];
 
-  # nix daemon (multi-user install)
-  services.nix-daemon.enable = true;
-
-  users.users.mikl = {
-    home = "/Users/mikl";
+  users.users.michaotic = {
+    home = "/Users/michaotic";
     shell = pkgs.zsh;
   };
 
   environment.systemPackages = [
     pkgs.vim
   ];
-}
+
+  system.stateVersion = 7;
+
+  # Home-manager configuration specific to poppy
+  home-manager.users.michaotic = {
+    imports = [ ../../home/kitty.nix ];
+
+    programs.zsh.shellAliases = {
+      switch = "darwin-rebuild switch --flake .#poppy";
+      update = "nix flake update && darwin-rebuild switch --flake .#poppy";
+      cleanup = "nix-collect-garbage -d";
+    };
+  };
+}