Update Sphinx
Our theme already supports sphinx>=2.0
@@ -11,9 +11,7 @@ django-autoslug==1.9.8
djangorestframework==3.12.2
# For intersphinx during builds
-# Use <2.x until we fix some issues in our theme.
-# Some things are not rendering properly and sidebar shows titles in gray.
-Sphinx==1.8.5 # pyup: <2.0.0
+Sphinx==3.5.2
# Filtering for the REST API
django-filter==2.4.0
