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

core/system/scripts/nomarchy-powerprofiles-list

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# Returns a list of all the available power profiles on the system.
+# Used by the Nomarchy Menu under Setup > Power Profile.
+
+powerprofilesctl list |
+  awk '/^\s*[* ]\s*[a-zA-Z0-9\-]+:$/ { gsub(/^[*[:space:]]+|:$/,""); print }' |
+  tac