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/NavigationRailExpandButton.qml

@@ -0,0 +1,30 @@
+import QtQuick
+import QtQuick.Layouts
+import qs.modules.common
+import qs.modules.common.widgets
+
+RippleButton {
+    id: root
+    Layout.alignment: Qt.AlignLeft
+    implicitWidth: 40
+    implicitHeight: 40
+    Layout.leftMargin: 8
+    onClicked: {
+        parent.expanded = !parent.expanded;
+    }
+    buttonRadius: Appearance.rounding.full
+
+    rotation: root.parent.expanded ? 0 : -180
+    Behavior on rotation {
+        animation: Appearance.animation.elementMoveFast.numberAnimation.createObject(this)
+    }
+
+    contentItem: MaterialSymbol {
+        id: icon
+        anchors.centerIn: parent
+        horizontalAlignment: Text.AlignHCenter
+        iconSize: 24
+        color: Appearance.colors.colOnLayer1
+        text: root.parent.expanded ? "menu_open" : "menu"
+    }
+}