config: update sitemap change frequency and ignore patterns

Changed sitemap change frequency from daily to weekly and added ignore patterns for 404 pages to improve SEO and site performance.

Signed-off-by: Chiho Sin <chihosin@icloud.com>

Author: chihosin

docusaurus.config.js

@@ -290,8 +290,9 @@ module.exports = {
         },
         sitemap: {
           lastmod: "datetime",
-          changefreq: "daily",
+          changefreq: "weekly",
           priority: 0.5,
+          ignorePatterns: ["/404", "/404/**"],
         },
         docs: {
           breadcrumbs: true,