bt_cms-8.x-1.x-dev/bt_cms.links.task.yml

bt_cms.website_task:
  title: 'Website'
  route_name: bt_cms.website
  base_route: bt_cms.website
  weight: -1

bt_cms.website_blocks_task:
  title: 'Blocks'
  route_name: entity.block_content.collection
  base_route: bt_cms.website
  weight: 1