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

themes/engine/plymouth.nix

@@ -0,0 +1,30 @@
+{ config, pkgs, lib, ... }:
+
+let
+  nomarchy-plymouth = pkgs.stdenv.mkDerivation {
+    pname = "nomarchy-plymouth";
+    version = "1.0";
+
+    src = ./plymouth;
+
+    installPhase = ''
+      mkdir -p $out/share/plymouth/themes/nomarchy
+      cp * $out/share/plymouth/themes/nomarchy/
+      # Fix path in the plymouth file to point to the nix store
+      sed -i "s|/[a-z]*/share/plymouth/themes/nomarchy|$out/share/plymouth/themes/nomarchy|g" $out/share/plymouth/themes/nomarchy/nomarchy.plymouth
+    '';
+  };
+in
+{
+  boot.initrd.systemd.enable = lib.mkDefault true;
+  boot.initrd.verbose = lib.mkDefault false;
+  console.earlySetup = lib.mkDefault true;
+  boot.consoleLogLevel = lib.mkDefault 0;
+  boot.plymouth = {
+    enable = lib.mkDefault true;
+    themePackages = lib.mkDefault [ nomarchy-plymouth ];
+    theme = lib.mkDefault "nomarchy";
+  };
+
+  boot.kernelParams = lib.mkDefault [ "quiet" "splash" "loglevel=3" "rd.systemd.show_status=false" "rd.udev.log_level=3" "udev.log_priority=3" "boot.shell_on_fail" ];
+}