Update data location

Author: ChrisCompton

docs/demo/graph/d3.md

@@ -13,7 +13,7 @@ theme: notebook
 // Example from: https://observablehq.com/@d3/donut-chart/2
 // data = FileAttachment("./population-by-age.csv").csv({typed: true})
 
-d3.csv("/static/data/population-by-age.csv", d3.autoType).then(data => {
+d3.csv("population-by-age.csv", d3.autoType).then(data => {
   const width = 500; // Define width
   const height = Math.min(width, 500);
   const radius = Math.min(width, height) / 2;