refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

features/scripts/utils/nomarchy-build-iso

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# Build the Nomarchy Installer ISO declaratively using the flake.
+
+echo "Building Nomarchy Installer ISO..."
+
+# The output will be a symlink named 'result' in the current directory
+nix build .#nixosConfigurations.installerIso.config.system.build.isoImage
+
+if [ $? -eq 0 ]; then
+    ISO_PATH=$(readlink -f result/iso/*.iso)
+    echo "Success! ISO built at: $ISO_PATH"
+    echo "You can now burn this to a USB drive using 'dd' or 'etcher'."
+else
+    echo "Error: ISO build failed."
+    exit 1
+fi