Don't let webpack bundle node-libs-browser

Dependencies pulled in by `require('crypto')` account for several
hundred kb of vendors.bundle.js.

https://medium.com/walmartlabs/webpack-optimization-a-case-study-92b130334b6c
webpack/webpack.js.org#1317

Author: foolip

config/webpack.common.js

@@ -73,7 +73,9 @@ module.exports = {
     extensions: ['.js'],
   },
   node: {
+    crypto: 'empty',
     fs: 'empty',
-    dns: 'empty',
+    path: 'empty',
+    process: false,
   },
 };

config/webpack.prod.js

@@ -49,7 +49,7 @@ module.exports = merge(common, {
     // recommendation of 250kb, but are combined with 'error' to ensure that
     // they don't grow accidentally beyond the current size.
     hints: 'error',
-    maxAssetSize: 1.45*1024*1024,
-    maxEntrypointSize: 2.13*1024*1024,
+    maxAssetSize: 1.1*1024*1024,
+    maxEntrypointSize: 1.8*1024*1024,
   },
 });