Add lunr search

Author: deccer

Diff for: docusaurus.config.ts

@@ -24,6 +24,10 @@ const config: Config = {
   onBrokenLinks: 'warn',
   onBrokenMarkdownLinks: 'warn',
 
+  plugins: [[ require.resolve('docusaurus-lunr-search'), {
+    languages: ['en'] // language codes
+  }]],
+
   // Even if you don't use internationalization, you can use this field to set
   // useful metadata like html lang. For example, if your site is Chinese, you
   // may want to replace "en" with "zh-Hans".