Add "Edit on gitlab" link
Add the link, example can be found at http://hub.pages.pasteur.fr/12765-viralhostrangedb/ and https://gitlab.pasteur.fr/hub/12765-viralhostrangedb/blob/master/doc/conf.py#L72-79
Add the link, example can be found at http://hub.pages.pasteur.fr/12765-viralhostrangedb/ and https://gitlab.pasteur.fr/hub/12765-viralhostrangedb/blob/master/doc/conf.py#L72-79