docs: def hwpack_names():
      """return installed hardware package names."""
      ls = hwpack_dir().listdir()
      ls = [x.name for x in ls]
      ls = [x for x in ls if x != 'tools']
      arduino_included = 'arduino' in ls
      ls = [x for x in ls if x != 'arduino']
      ls.sort()
      if arduino_included:
          ls = ['arduino'] + ls  # move to 1st pos
      return ls