Following the nice tutorial here: https://medium.com/@mbostock/command-line-cartography-part-1-897aa8f8ca2c
ETRS89 projection https://observablehq.com/@d3/conic-conformal
shape file from https://www.arcgis.com/home/item.html?id=ae25571c60d94ce5b7fcbf74e27c00e0
https://raw.githubusercontent.com/eurostat/Nuts2json/master/2016/3035/20M/0.json https://eurostat.github.io/Nuts2json/