Add single-sourced catalog migration page

Author: kbatuigas

modules/ROOT/nav.adoc

@@ -398,14 +398,15 @@
 ** xref:manage:mountable-topics.adoc[]
 ** xref:manage:iceberg/index.adoc[Iceberg]
 *** xref:manage:iceberg/about-iceberg-topics.adoc[]
+*** xref:manage:iceberg/migrate-to-iceberg-topics.adoc[]
 *** xref:manage:iceberg/specify-iceberg-schema.adoc[]
 *** xref:manage:iceberg/use-iceberg-catalogs.adoc[]
 *** xref:manage:iceberg/rest-catalog/index.adoc[]
 **** xref:manage:iceberg/iceberg-topics-aws-glue.adoc[AWS Glue]
 **** 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:iceberg/migrate-iceberg-catalog.adoc[]
 *** xref:manage:iceberg/iceberg-performance-tuning.adoc[]
 *** xref:manage:iceberg/iceberg-troubleshooting.adoc[]
 ** xref:manage:schema-reg/index.adoc[Schema Registry]

modules/manage/pages/iceberg/migrate-iceberg-catalog.adoc

@@ -0,0 +1,5 @@
+= Migrate Iceberg Catalogs
+:description: Switch the Iceberg catalog backend for an existing Redpanda cluster without losing untranslated topic data.
+:page-categories: Iceberg, Migration
+
+include::ROOT:manage:iceberg/migrate-iceberg-catalog.adoc[tag=single-source]