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We just got hierarchical tags.  A tag can have one or more children, and when you search on a tag you can either search just that tag or also search its children.  This gives us another way to organize content.

This feature was [proposed](https://judaism.codidact.com/questions/276376) on the Judaism site; you can see more background there.  (This was also a longstanding request on Mi Yodeya, and its absence led to some cumbersome tag names.)  This seems like it could be useful here, and we can do it opportunistically: we're not building a *whole tree*, but in cases where tags are clearly specializations of other tags, we can now link them together.

As a demonstration, I've created one child of the [technical-writing tag](https://writing.codidact.com/categories/1/tags/121).  Please use this meta post to discuss whether and where we'd like to create other tag relationships.

A tag can have only one parent; this isn't C++. :-)