improve upon conf.py

Signed-off-by: Fotis Georgatos <fotis@cern.ch>
improve upon Configuration.rst

Signed-off-by: Fotis Georgatos <fotis@cern.ch>
improve upon index.rst

Signed-off-by: Fotis Georgatos <fotis@cern.ch>
bump minor in conf.py

Signed-off-by: Fotis Georgatos <fotis@cern.ch>