Bump the Django, Django Evolution, and doc-related versions.
Review Request #11283 — Created Nov. 17, 2020 and submitted
This updates our minimum Django version to 1.11.29 (the latest Django
1.11.x version) and our Django Evolution to 2.1 (required for creating
new databases on MySQL and Postgres).
There's a couple of doc-related version variables that were bumped as
well. Django-related references in docs now link to Django 1.11, and
Djblets-related references link to Djblets 2.0.
Installed and tested with these versions.
Verified references in docs.