refactor: consolidate app configurations and utility scripts

- Move 32+ app-specific scripts from features/apps/scripts/ to features/scripts/utils/ for centralized packaging.
- Create individual Nix modules for orphaned app configurations (btop, kitty, tmux, etc.) in features/apps/ using xdg.configFile.
- Fix broken paths in core/system/makima.nix and features/apps/vscode.nix.
- Update VSCode configuration to use the modern 'profiles.default.userSettings' API, resolving deprecation warnings.
- Merge duplicate 'nomarchy-launch-walker' scripts into a single robust utility.
- Remove stale root 'config/' directory.
- Update README.md and docs/creating-themes.md to reflect the new architecture and keybindings.
- Ensure all modules are correctly imported and verified via nix flake check.

core/system/makima.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfg = config.nomarchy.system.features.makima;
+in
+{
+  config = lib.mkIf cfg {
+    # If the user has makima-bin available in their overlays (as they originally used a custom package),
+    # this will install it. Otherwise, it will fail evaluation if not available in nixpkgs.
+    environment.systemPackages = [ pkgs.makima-bin ];
+
+    environment.etc."makima/AT Translated Set 2 keyboard.toml".source = ../../features/apps/makima + "/AT Translated Set 2 keyboard.toml";
+
+    systemd.services.makima = {
+      description = "Makima key remapping service";
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        User = config.services.displayManager.autoLogin.user;
+        Environment = "MAKIMA_CONFIG=/etc/makima";
+        ExecStart = "${pkgs.makima-bin}/bin/makima";
+        Restart = "on-failure";
+      };
+    };
+  };
+}