Enable Lunr search bar

Summary: ^

Reviewed By: jknoxville

Differential Revision: D47548867

fbshipit-source-id: 462496da3d2668f9991e66381ca5ca0dd9c45ea9

website/docusaurus.config.js

@@ -205,6 +205,7 @@ const siteConfig = {
   // end_config_example
   plugins: [
     './src/plugins/support-symlinks',
+    ...fbContent({internal: [], external: [require.resolve('docusaurus-lunr-search')]}),
     [
       require.resolve('@docusaurus/plugin-content-pages'),
       {