chore: update demo

src/demo/data/pie.js

@@ -0,0 +1,40 @@
+export default {
+  textStyle: {
+    fontFamily: 'Inter, "Helvetica Neue", Arial, sans-serif'
+  },
+  title: {
+    text: "Traffic Sources",
+    left: "center"
+  },
+  tooltip: {
+    trigger: "item",
+    formatter: "{a} <br/>{b} : {c} ({d}%)"
+  },
+  legend: {
+    orient: "vertical",
+    left: "left",
+    data: ["Direct", "Email", "Ad Networks", "Video Ads", "Search Engines"]
+  },
+  series: [
+    {
+      name: "Traffic Sources",
+      type: "pie",
+      radius: "55%",
+      center: ["50%", "60%"],
+      data: [
+        { value: 335, name: "Direct" },
+        { value: 310, name: "Email" },
+        { value: 234, name: "Ad Networks" },
+        { value: 135, name: "Video Ads" },
+        { value: 1548, name: "Search Engines" }
+      ],
+      emphasis: {
+        itemStyle: {
+          shadowBlur: 10,
+          shadowOffsetX: 0,
+          shadowColor: "rgba(0, 0, 0, 0.5)"
+        }
+      }
+    }
+  ]
+};