Add migration pages to Cloud (#511)

* Add migration pages to Cloud

* Update local-antora-playbook.yml

Author: kbatuigas

modules/ROOT/nav.adoc

@@ -459,6 +459,7 @@
 **** xref:manage:iceberg/iceberg-topics-databricks-unity.adoc[Databricks Unity Catalog]
 **** xref:manage:iceberg/redpanda-topics-iceberg-snowflake-catalog.adoc[Snowflake and Open Catalog]
 *** xref:manage:iceberg/query-iceberg-topics.adoc[]
+*** xref:manage:iceberg/migrate-to-iceberg-topics.adoc[]
 ** xref:manage:schema-reg/index.adoc[Schema Registry]
 *** xref:manage:schema-reg/schema-reg-overview.adoc[]
 *** xref:manage:schema-reg/schema-reg-ui.adoc[]

modules/manage/pages/iceberg/migrate-to-iceberg-topics.adoc

@@ -0,0 +1,9 @@
+= Migrate to Iceberg Topics
+:description: Migrate existing Iceberg integrations to Redpanda Iceberg topics.
+:page-topic-type: how-to
+:page-categories: Iceberg, Migration, Integration
+:learning-objective-1: Compare external Iceberg integrations with Iceberg Topics architectures
+:learning-objective-2: Implement data merge strategies using SQL patterns
+:learning-objective-3: Execute validation checks and perform cutover procedures
+
+include::ROOT:manage:iceberg/migrate-to-iceberg-topics.adoc[tag=single-source]