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.

features/scripts/utils/nomarchy-restart-terminal

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [[ -f ~/.config/alacritty/alacritty.toml ]]; then
+  touch ~/.config/alacritty/alacritty.toml
+fi
+
+if pgrep -x kitty >/dev/null; then
+  killall -SIGUSR1 kitty >/dev/null
+fi
+
+if pgrep -x ghostty >/dev/null; then
+  killall -SIGUSR2 ghostty
+fi