feat: move core apps to downstream and make app modules opt-in

docs/MIGRATION.md

@@ -123,11 +123,24 @@ create minimal versions to start:
 { pkgs, ... }:
 {
   home.packages = with pkgs; [
-    btop
+    firefox
+    xfce.thunar
+    imv
+    mpv
     fastfetch
     chromium
-    # …add anything you want; firefox/thunar/mpv/mako/etc. ship with Nomarchy.
+    # …add anything you want; mako/hyprlock/swww/rofi/etc. ship with Nomarchy.
   ];
+
+  # Enable Nomarchy's curated app configurations
+  nomarchy.apps = {
+    alacritty.enable = true;
+    btop.enable = true;
+    elephant.enable = true;
+    swayosd.enable = true;
+    walker.enable = true;
+    vscode.enable = true;
+  };
 }
 ```