DOC-1087 Use single source tag across all Iceberg docs

modules/manage/pages/iceberg/about-iceberg-topics.adoc

@@ -1,4 +1,5 @@
 = About Iceberg Topics
 :description: Learn how Redpanda can integrate topics with Apache Iceberg.
+:page-categories: Iceberg, Tiered Storage, Management, High Availability, Data Replication, Integration
 
-include::ROOT:manage:partial$iceberg/about-iceberg-topics.adoc[]
+include::ROOT:manage:iceberg/about-iceberg-topics.adoc[tag=single-source]

modules/manage/pages/iceberg/query-iceberg-topics.adoc

@@ -1,6 +1,5 @@
 = Query Iceberg Topics
 :description: Query Redpanda topic data stored in Iceberg tables, based on the topic Iceberg mode and schema.
+:page-categories: Iceberg, Tiered Storage, Management, High Availability, Data Replication, Integration
 
-When you access Iceberg topics from a data lakehouse or other Iceberg-compatible tools, how you consume the data depends on the xref:manage:iceberg/about-iceberg-topics.adoc#enable-iceberg-integration[Iceberg mode] you've chosen for a topic, and whether you've registered a schema for the topic in the xref:manage:schema-reg/schema-reg-overview.adoc[Redpanda Schema Registry]. You do not need to rely on complex ETL jobs or pipelines to access real-time data from Redpanda.
-
-include::ROOT:manage:partial$iceberg/query-iceberg-topics.adoc[]
+include::ROOT:manage:iceberg/query-iceberg-topics.adoc[tag=single-source]

modules/manage/pages/iceberg/use-iceberg-catalogs.adoc

@@ -1,8 +1,5 @@
 = Use Iceberg Catalogs
 :description: Learn how to access Redpanda topic data stored in Iceberg tables, using table metadata or a catalog integration.
+:page-categories: Iceberg, Tiered Storage, Management, High Availability, Data Replication, Integration
 
-include::ROOT:manage:partial$iceberg/use-iceberg-catalogs.adoc[]
-
-== Next steps
-
-* xref:manage:iceberg/query-iceberg-topics.adoc[]
+include::ROOT:manage:iceberg/use-iceberg-catalogs.adoc[tag=single-source]