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-tui-remove

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -e
+
+ICON_DIR="$HOME/.local/share/applications/icons"
+DESKTOP_DIR="$HOME/.local/share/applications/"
+
+if (( $# == 0 )); then
+  # Find all TUIs
+  while IFS= read -r -d '' file; do
+    if grep -qE '^Exec=.*(\$TERMINAL|xdg-terminal-exec).*-e' "$file"; then
+      TUIS+=("$(basename "${file%.desktop}")")
+    fi
+  done < <(find "$DESKTOP_DIR" -name '*.desktop' -print0)
+
+  if ((${#TUIS[@]})); then
+    IFS=$'\n' SORTED_TUIS=($(sort <<<"${TUIS[*]}"))
+    unset IFS
+    APP_NAMES_STRING=$(gum choose --no-limit --header "Select TUI to remove..." --selected-prefix="✗ " "${SORTED_TUIS[@]}")
+    # Convert newline-separated string to array
+    APP_NAMES=()
+    while IFS= read -r line; do
+      [[ -n $line ]] && APP_NAMES+=("$line")
+    done <<< "$APP_NAMES_STRING"
+  else
+    echo "No TUIs to remove."
+    exit 1
+  fi
+else
+  # Use array to preserve spaces in app names
+  APP_NAMES=("$@")
+fi
+
+if (( ${#APP_NAMES[@]} == 0 )); then
+  echo "You must provide TUI names."
+  exit 1
+fi
+
+for APP_NAME in "${APP_NAMES[@]}"; do
+  rm -f "$DESKTOP_DIR/$APP_NAME.desktop"
+  rm -f "$ICON_DIR/$APP_NAME.png"
+  echo "Removed $APP_NAME"
+done