add airflow and superset to supported products

Author: maltesander

docs/modules/opa/pages/index.adoc

@@ -51,6 +51,8 @@ Currently the following products on the Stackable Data Platform support policy d
 * xref:druid:usage-guide/security.adoc#_authorization_with_open_policy_agent_opa[Apache Druid]
 * xref:kafka:usage-guide/security.adoc#_authorization[Apache Kafka]
 * xref:trino:usage-guide/security.adoc#_authorization[Trino]
+* xref:airflow:usage-guide/security.adoc#_open_policy_agent[Apache Airflow]
+* xref:superset:usage-guide/security.adoc#_opa_role_mapping[Apache Superset]
 
 == Supported versions