put shell in subdir, and add nix package

shell/shell.qml

@@ -0,0 +1,30 @@
+//@ pragma UseQApplication
+//@ pragma IconTheme Papirus-Dark
+
+import Quickshell
+import QtQuick
+import "bar" as Bar
+import "notifications" as Notifications
+import "mpris" as Mpris
+import "volume-osd" as VolumeOSD
+import "settings" as Settings
+import "launcher" as Launcher
+import "lockscreen" as LockScreen
+import "wallpaper" as Wallpaper
+import "screencapture" as ScreenCapture
+
+ShellRoot {
+    Bar.Controller {}
+    Wallpaper.Controller {}
+    Notifications.Controller {}
+    VolumeOSD.Controller {}
+
+    Component.onCompleted: {
+        Launcher.Controller.init();
+        Settings.Controller.init();
+        ScreenCapture.Controller.init();
+        Mpris.Controller.init();
+        Notifications.NotificationCenter.init();
+        LockScreen.Controller.init();
+    }
+}