[Merge after https://github.com/oppia/oppia/pull/21266 is merged] Remove references to Python 2. #410
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This PR removes references to Python 2 from the setup instructions and cleans up a few other places as well.
This PR should only be merged once oppia/oppia#21266 is merged, since that PR moves to GCP version 500.0.0 which eliminates dependence on Python 2 for dev_appserver.py.