James E. Blair 202ca394fb Switch docs theme to versioned RTD
To match change I2870450ffd02f55509fcc1297d050b09deafbfb9 in Zuul.

Change-Id: Ic23dcbc743ca1c79bcead8eebd2899c00e0750c6
2021-12-16 11:23:09 -08:00
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