Add new plot about how many "edits per year" devided by the "total amount of edits a contributor did"

[piebro]

Add a plot like this one: https://piebro.github.io/openstreetmap-statistics/#d993 but instead of sorting with "year of the first edit" sort it with how many total edits a contributor did in total (like in the third plot here: https://piebro.github.io/openstreetmap-statistics/#63f6).