feat(chart.js) add year label
feat(chart.js) initialize a load json data function
feat(chart.js) add a bisector since many nation's data is sparsely defined
feat(chart.js) add a dot per nation, initialize the data at 1800, and set the colors
fix(chart.js) add position and sort to dots
feat(chart.js) add title to each dot
feat(chart.js) add an overlay for the year label
feat(chart.js) start a transition that interpolates the data based on year
feat(chart.js) add position function which positions the dot based on the data
feat(chart.js) create a order function that defines a sort order so that the smallest dots are drawn on top