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/notificationPopup/NotificationPopup.qml

@@ -0,0 +1,50 @@
+import qs
+import qs.modules.common
+import qs.modules.common.widgets
+import qs.services
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import Quickshell
+import Quickshell.Wayland
+import Quickshell.Hyprland
+
+Scope {
+    id: notificationPopup
+
+    PanelWindow {
+        id: root
+        visible: (Notifications.popupList.length > 0) && !GlobalStates.screenLocked
+        screen: Quickshell.screens.find(s => s.name === Hyprland.focusedMonitor?.name) ?? null
+
+        WlrLayershell.namespace: "quickshell:notificationPopup"
+        WlrLayershell.layer: WlrLayer.Overlay
+        exclusiveZone: 0
+
+        anchors {
+            top: true
+            right: true
+            bottom: true
+        }
+
+        mask: Region {
+            item: listview.contentItem
+        }
+
+        color: "transparent"
+        implicitWidth: Appearance.sizes.notificationPopupWidth
+
+        NotificationListView {
+            id: listview
+            anchors {
+                top: parent.top
+                bottom: parent.bottom
+                right: parent.right
+                rightMargin: 4
+                topMargin: 4
+            }
+            implicitWidth: parent.width - Appearance.sizes.elevationMargin * 2
+            popup: true
+        }
+    }
+}