Update next.config.js (#5593)

Tests using a case insensitive expression.
Fixes assets output folder.
Reduce `limit` so we can use `file-loader` on larger files.

examples/with-semantic-ui/next.config.js

@@ -3,13 +3,13 @@ const withCss = require('@zeit/next-css')
 module.exports = withCss({
   webpack (config) {
     config.module.rules.push({
-      test: /\.(png|svg|eot|otf|ttf|woff|woff2)$/,
+      test: /\.(png|svg|eot|otf|ttf|woff|woff2)$/i,
       use: {
         loader: 'url-loader',
         options: {
-          limit: 100000,
+          limit: 8192,
           publicPath: './',
-          outputPath: 'static/',
+          outputPath: 'static/css/',
           name: '[name].[ext]'
         }
       }