Turnover percentages

Let's figure out how to sort the teams by median opp_tov_pct

// https://observablehq.com/@d3/d3-groupsort
const teams_by_opp_tov = d3.groupSort(
  games,
  g => -d3.median(g, d => d.opp_tov_pct),
  d => d.team_abb,
)