Fixed the index.rst to match joint docs requirements

enabled an automatic merge when the pipeline for 972a94e4 succeeds

FYI, we are building all the docs in one repo here: https://gitlab.idiap.ch/bob/docs The docs will show up here: https://www.idiap.ch/software/bob/docs/bob/docs/master/index.html

This merge request improves their view in there.

merged

mentioned in commit e738887f