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-launch-or-focus

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Launch or focus on a given command identified by the passed in window-pattern.
+# Use by some default bindings, like the one for Spotify, to ensure there is only one instance of the application open.
+
+if (($# == 0)); then
+  echo "Usage: nomarchy-launch-or-focus [window-pattern] [launch-command]"
+  exit 1
+fi
+
+WINDOW_PATTERN="$1"
+LAUNCH_COMMAND="${2:-"uwsm-app -- $WINDOW_PATTERN"}"
+WINDOW_ADDRESS=$(hyprctl clients -j | jq -r --arg p "$WINDOW_PATTERN" '.[]|select((.class|test("\\b" + $p + "\\b";"i")) or (.title|test("\\b" + $p + "\\b";"i")))|.address' | head -n1)
+
+if [[ -n $WINDOW_ADDRESS ]]; then
+  hyprctl dispatch focuswindow "address:$WINDOW_ADDRESS"
+else
+  eval exec setsid $LAUNCH_COMMAND
+fi