docs: metadata (#4677)

* update description and add metadata

* home de-duplicate

docs/src/pages/index.js

@@ -271,8 +271,7 @@ export default function Home() {
   const { siteConfig = {} } = context;
   return (
     <Layout
-      title={`${siteConfig.title}`}
-      description="This site bundles ZITADELs Documentations"
+      description={`${siteConfig.customFields.description}`}
     >
       <header className={clsx("hero", styles.heroBanner)}>
         <div className="container">