Remove version/release from Sphinx docs.

It became problematic with setuptools_scm. There is probably a better
solution, but for now the release/version will just be removed from the
docs.

Author: pelme

docs/conf.py

@@ -48,11 +48,6 @@
 # built documents.
 #
 # The short X.Y version.
-sys.path.append(os.path.abspath(os.path.join(__file__, '../..')))
-
-version = __import__('pytest_django').__version__
-# The full version, including alpha/beta/rc tags.
-release = __import__('pytest_django').__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.