add next.config.js for fixing react spring issue

see also:

- https://github.com/pmndrs/react-spring/issues/1078
- https://github.com/plouc/nivo/issues/1290

frontend/next.config.js

@@ -0,0 +1,16 @@
+const withTM = require('next-transpile-modules')
+  ([
+    '@react-spring/three',
+    '@react-spring/web',
+  ])
+
+module.exports = withTM({
+  webpack: config => {
+    config.module.rules.push({
+      test: /react-spring/,
+      sideEffects: true,
+    })
+
+    return config
+  },
+})