References
7.10 Visualisation
https://r-statistics.co/Top50-Ggplot2-Visualizations-MasterList-R-Code.html
https://gramener.github.io/visual-vocabulary-vega/
https://r-graph-gallery.com/199-correlation-matrix-with-ggally.html
7.11 R, visualisation et données spatiales
https://statnmap.com/2018-07-14-introduction-to-mapping-with-sf-and-co/