Andreas Jaeger 78dc56d979 Update docstheme
With version 2.1, we renamed options in the extension, let's use them
here as well.

Increase also requirements for reno and Sphinx.

Change-Id: Ica3cc991ad7bcc1626b805ede57c9c23e2538239
2020-05-15 08:50:51 +02:00
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