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/desktop/hyprland/config/bindings.conf

@@ -29,6 +29,6 @@ bindd = SUPER SHIFT ALT, X, X Post, exec, nomarchy-launch-webapp "https://x.com/
 # Add extra bindings
 # bind = SUPER SHIFT, R, exec, alacritty -e ssh your-server
 
-# Overwrite existing bindings, like putting Nomarchy Menu on Super + Space
+# Overwrite existing bindings, like putting Nomarchy Menu back on Super + Space
 # unbind = SUPER, SPACE
 # bindd = SUPER, SPACE, Nomarchy menu, exec, nomarchy-menu