* feat: add components to container api
* feat: remove and replace components in container api
* refactor: container childern api
* chore: fix lint issues
* temp: install openedx-learning dev branch
* feat: update publish_status and children count in index
* chore: fix mypy issues
* test: fix reindex test
* refactor: rebase and fix conflicts
* test: update test to check signals
* docs: document can_stand_alone flag
* chore: bump openedx-learning version