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/ContentSection.qml

@@ -0,0 +1,23 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import qs.modules.common
+import qs.modules.common.widgets
+
+ColumnLayout {
+    id: root
+    property string title
+    default property alias data: sectionContent.data
+
+    Layout.fillWidth: true
+    spacing: 8
+    StyledText {
+        text: root.title
+        font.pixelSize: Appearance.font.pixelSize.larger
+        font.weight: Font.Medium
+    }
+    ColumnLayout {
+        id: sectionContent
+        spacing: 8
+    }
+}