[Beta] Build for modern browsers (#4682)

beta/next.config.js

@@ -10,9 +10,9 @@ module.exports = {
   pageExtensions: ['jsx', 'js', 'ts', 'tsx', 'mdx', 'md'],
   experimental: {
     plugins: true,
-    // TODO: this doesn't work because https://github.com/vercel/next.js/issues/30714
-    concurrentFeatures: false,
     scrollRestoration: true,
+    legacyBrowsers: false,
+    browsersListForSwc: true,
   },
   async redirects() {
     return redirects.redirects;