The source project of this merge request has been removed.
Revert MPLCONFIG override
This seems unrelated to the commit it originated from, so I think we should revert it. If it turns out to be necessary for some reason unrelated to the Sphinx layout change, then we should track that down separately.
I haven't been able to replicate a problem without this MPLCONFIGDIR override in place, although it does seem that matplotlib is used in some of the autopkgtests, so those could be worth further investigation.
Relates-to commit 59361c69.