feat(contributor): Added a new contributor to the slide show

[spencer-forrest-opt]

A new issue will be created because the contributor 'dsantos', alias @Dougniel, does not have his style sheet linked in the root 'index.html'.

[adriens]

Thanks a lot @spencer-forrest-opt

[adriens]

@spencer-forrest-opt : you do not appear on the slideshow : when on the last slide (@Dougniel ), we're back on the first slide

[adriens]

Some GH cahce issue, then it's :ok_hand:

https://adriens.github.io/livre-or-collaborateurs-glia-slideshow/#/8

Officially welcome to GLIA :clap: :open_hands:

[spencer-forrest-opt]

'dsantos' style sheet issue: https://github.com/adriens/livre-or-collaborateurs-glia-slideshow/issues/67