new_contents: from sitetree.utils import tree, item
  
  sitetrees = (
      tree('builders', items=[
          item('Builders', 'builder.list', children=[
              item('{{ builder.name }}', 'builder.detail builder.slug', in_menu=False, in_sitetree=False, children=[
                  item('Reviews', 'review.list builder.slug', in_menu=False, in_sitetree=False, children=[
                      item('{{ review.costume_name }} by {{ builder.name }} Review', 'review.detail builder.slug review.slug', in_menu=False, in_sitetree=False),
                  ]),
              ]),
  
              item('Edit "{{ builder.name }}"', 'builder.edit builder.slug', in_menu=False, in_sitetree=False),
              item('Delete "{{ builder.name }}"', 'builder.delete builder.slug', in_menu=False, in_sitetree=False),
          ])
      ]),
  )
  
subject: add sitetree to builders