docs: metadata (#4677)

* update description and add metadata

* home de-duplicate

docs/docusaurus.config.js

@@ -18,7 +18,11 @@ module.exports = {
       "data-api": "/proxy/api/event",
     },
   ],
+  customFields: {
+    description: "Documentation for ZITADEL - The best of Auth0 and Keycloak combined. Built for the serverless era.",
+  },
   themeConfig: {
+    metadata: [{name: 'keywords', content: 'zitadel, documentation, jwt, saml, oauth2, authentication, serverless, login, auth, authorization, sso, openid-connect, oidc, mfa, 2fa, passkeys, fido2, docker'}],
     zoom: {
       selector: ".markdown :not(em) > img",
       background: {

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">