fix docz production build

gatsby-config.js

@@ -1,3 +1,14 @@
 require('dotenv').config({
   path: '.env',
 });
+
+module.exports = {
+  plugins: [
+    {
+      resolve: 'gatsby-plugin-react-leaflet',
+      options: {
+        linkStyles: true,
+      },
+    },
+  ],
+};