Changing `min-content` to `auto` is the big change here.  Also, I'd used
the wrong syntax for `grid-area`, but I didn't need that anyway.

📚 Fix rdoc issues

This updates the parser to handle the VANISHED response, and adds a new
response data class: VanishedData.

VanishedData was originally written as a plain class and then converted
to Data.  I'm keeping most of the tests that I wrote prior to converting
it to Data, but I probably wouldn't have written many of them if I had
used Data in the first place.

Both the `QRESYNC` and `UIDONLY` extensions replace `EXPUNGE` responses
with `VANISHED` responses.  This updates the #expunge and #uid_expunge
commands to return VanishedData, rather than a (misleading) empty array.

✨ Add support for VANISHED responses