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/StyledTextInput.qml

@@ -0,0 +1,17 @@
+import qs.modules.common
+import QtQuick
+import QtQuick.Controls
+
+/**
+ * Does not include visual layout, but includes the easily neglected colors.
+ */
+TextInput {
+    renderType: Text.NativeRendering
+    selectedTextColor: Appearance.m3colors.m3onSecondaryContainer
+    selectionColor: Appearance.colors.colSecondaryContainer
+    font {
+        family: Appearance?.font.family.main ?? "sans-serif"
+        pixelSize: Appearance?.font.pixelSize.small ?? 15
+        hintingPreference: Font.PreferFullHinting
+    }
+}