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/matugen/templates/fuzzel/fuzzel_theme.ini

@@ -0,0 +1,9 @@
+# Material You theme for Fuzzel launcher
+[colors]
+background={{colors.background.default.hex_stripped}}ff
+text={{colors.on_background.default.hex_stripped}}ff
+selection={{colors.surface_variant.default.hex_stripped}}ff
+selection-text={{colors.on_surface_variant.default.hex_stripped}}ff
+border={{colors.surface_variant.default.hex_stripped}}dd
+match={{colors.primary.default.hex_stripped}}ff
+selection-match={{colors.primary.default.hex_stripped}}ff