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/NotificationActionButton.qml

@@ -0,0 +1,24 @@
+import qs.modules.common
+import qs.services
+import QtQuick
+import Quickshell.Services.Notifications
+
+RippleButton {
+    id: button
+    property string buttonText
+    property string urgency
+
+    implicitHeight: 30
+    leftPadding: 15
+    rightPadding: 15
+    buttonRadius: Appearance.rounding.small
+    colBackground: (urgency == NotificationUrgency.Critical) ? Appearance.colors.colSecondaryContainer : Appearance.colors.colSurfaceContainerHighest
+    colBackgroundHover: (urgency == NotificationUrgency.Critical) ? Appearance.colors.colSecondaryContainerHover : Appearance.colors.colSurfaceContainerHighestHover
+    colRipple: (urgency == NotificationUrgency.Critical) ? Appearance.colors.colSecondaryContainerActive : Appearance.colors.colSurfaceContainerHighestActive
+
+    contentItem: StyledText {
+        horizontalAlignment: Text.AlignHCenter
+        text: buttonText
+        color: (urgency == NotificationUrgency.Critical) ? Appearance.m3colors.m3onSurfaceVariant : Appearance.m3colors.m3onSurface
+    }
+}