Add a showcase

[bchretien]

It would be nice at some point to have a "showcase" section on the website that shows the projects/papers that use RobOptim.

We should also add a few lines explaining how to cite RobOptim in research papers (i.e. citing the ROBOMEC paper).

[thomas-moulard]

👍
The first version is good, we should work to put more figures, illustrations and link to videos.

[francois-keith]

Up for the explanation on how to cite roboptim, preferably in the showcase page.

[bchretien]

@francois-keith since there are several papers now + Zenodo, I leave that choice to @thomas-moulard