docs: add description frontmatter to content pages for SEO (#11654)

apps/docs/content/guides/migrate/introduction.mdx

@@ -1,5 +1,6 @@
 ---
 title: Migrate to ZITADEL
+description: "Strategy for migrating identity data, users, and configurations to ZITADEL from other providers."
 sidebar_label: Introduction
 ---
 

apps/docs/content/guides/migrate/sources/auth0.mdx

@@ -1,5 +1,6 @@
 ---
 title: Migrate from Auth0 to ZITADEL (Including Password Hashes)
+description: "Migrate users, metadata, and password hashes from Auth0 to ZITADEL."
 sidebar_label: From Auth0
 ---
 

apps/docs/content/guides/migrate/sources/keycloak.mdx

@@ -1,6 +1,7 @@
 ---
 
 title: Migrate from Keycloak
+description: "Transition from Keycloak to ZITADEL using CLI tools to migrate users, configurations, and password hashes."
 sidebar_label: From Keycloak
 ---
 

apps/docs/content/guides/migrate/sources/zitadel.mdx

@@ -1,5 +1,6 @@
 ---
 title: Migrate from ZITADEL
+description: "Strategy for migrating between ZITADEL instances, including data export and import using service accounts."
 sidebar_label: From ZITADEL
 ---
 

apps/docs/content/guides/migrate/users.mdx

@@ -1,5 +1,6 @@
 ---
 title: Migrate Users
+description: "Explore APIs and strategies for importing user accounts and legacy credentials into ZITADEL."
 sidebar_label: Users
 ---