Copy browserslist into prod website build (#5196)

Author: devongovett

scripts/buildWebsite.js

@@ -113,6 +113,7 @@ async function build() {
   fs.copySync(path.join(__dirname, '..', 'postcss.config.js'), path.join(dir, 'postcss.config.js'));
   fs.copySync(path.join(__dirname, '..', 'lib'), path.join(dir, 'lib'));
   fs.copySync(path.join(__dirname, '..', 'CONTRIBUTING.md'), path.join(dir, 'CONTRIBUTING.md'));
+  fs.copySync(path.join(__dirname, '..', '.browserslistrc'), path.join(dir, '.browserslistrc'));
 
   // Delete mdx files from dev/docs that shouldn't go out yet.
   let devPkg = JSON.parse(fs.readFileSync(path.join(dir, 'packages/dev/docs/package.json'), 'utf8'));