Add sitemap.xml generation during build

docusaurus.config.js

@@ -64,6 +64,12 @@ const config = {
         theme: {
           customCss: require.resolve('./src/css/custom.css'),
         },
+	sitemap: {
+          changefreq: 'weekly',
+          priority: 0.5,
+          ignorePatterns: ['/tags/**'],
+          filename: 'sitemap.xml',
+        },
       }),
     ],
   ],