Use public dir for static assets

main.js

@@ -33,7 +33,7 @@ const styles = {
       anchor: [0.5, 46],
       anchorXUnits: 'fraction',
       anchorYUnits: 'pixels',
-      src: 'data/icon.png',
+      src: '/img/icon.png',
     }),
   }),
   iconVan: new Style({
@@ -41,7 +41,7 @@ const styles = {
       anchor: [0.5, 16],
       anchorXUnits: 'fraction',
       anchorYUnits: 'pixels',
-      src: 'data/van-100px.png',
+      src: '/img/van-100px.png',
     }),
   }),
   circleBlack: new Style({