remove leading slash on publicPath (#11174)

webpack.config.js

@@ -61,7 +61,7 @@ const config = (module.exports = {
     path: BUILD_PATH + "/app/dist",
     // NOTE: the filename on disk won't include "?[chunkhash]" but the URL in index.html generated by HtmlWebpackPlugin will:
     filename: "[name].bundle.js?[hash]",
-    publicPath: "/app/dist/",
+    publicPath: "app/dist/",
   },
 
   module: {
@@ -85,7 +85,7 @@ const config = (module.exports = {
       },
       {
         test: /\.(eot|woff2?|ttf|svg|png)$/,
-        use: [{ loader: "file-loader" }],
+        use: [{ loader: "file-loader", options: { publicPath: "" } }],
       },
       {
         test: /\.css$/,