Make flake self-contained - consolidate installer-replication

BREAKING CHANGE: Remove external dots-hyprland dependency

- Imported all essential configs from dots-hyprland/installer-replication
- Added complete configs/ directory with:
  - hypr/ - Hyprland configuration
  - quickshell/ - Quickshell widgets and config
  - applications/ - Application configurations
  - scripts/ - Utility scripts
  - matugen/ - Material You theming
- Updated flake.nix to use local ./configs instead of external repo
- Simplified update-flake script (removed external repo management)
- Updated README to reflect self-contained architecture
- All builds pass with local configurations

Benefits:
- No external repository dependencies
- Faster builds (no network dependencies)
- Version controlled configs in single repo
- Easier maintenance and development
- Complete installer replication in one place

configs/quickshell/modules/common/widgets/NotificationListView.qml

@@ -0,0 +1,27 @@
+import qs
+import qs.modules.common
+import qs.modules.common.widgets
+import qs.services
+import QtQuick
+import Quickshell
+
+StyledListView { // Scrollable window
+    id: root
+    property bool popup: false
+
+    spacing: 3
+
+    model: ScriptModel {
+        values: root.popup ? Notifications.popupAppNameList : Notifications.appNameList
+    }
+    delegate: NotificationGroup {
+        required property int index
+        required property var modelData
+        popup: root.popup
+        anchors.left: parent?.left
+        anchors.right: parent?.right
+        notificationGroup: popup ? 
+            Notifications.popupGroupsByAppName[modelData] :
+            Notifications.groupsByAppName[modelData]
+    }
+}