Containers & children

Several types are containers: a course, a web series, a project and a trip are each a post that also carries a public tag. Their children point back by making that public tag their primary tag.

The container pairs

• #course → #lesson children at /courses/{course}/{lesson}/
• #webseries → #episode children at /webseries/{series}/{episode}/
• #project → #project-detail steps at /projects/{project}/{step}/
• #trip → #travel posts at /travel/{trip}/{post}/

When importing demo content, keep a container and its children together so nothing is orphaned.