docs(advanced): removed mapper

docs/pages/v2/advanced.mdx

@@ -5,7 +5,6 @@ This section provides detailed information on the some of the advanced features
 - [Stateful Cursor](advanced/stateful_cursor): provides a mechanism to persist the "position" of the processing pipeline to make it resilient to restarts.
 - [Rollback Buffer](advanced/rollback_buffer): provides a way to mitigate the impact of chain rollbacks in downstream stages.
 - [Pipeline Metrics](advanced/pipeline_metrics): allows operators to track the progress and performance of long-running Oura sessions.
-- [Mapper Options](advanced/mapper_options): A set of "expensive" event mapping procedures that require an explicit opt-in to be activated.
 - [Intersect Options](advanced/intersect_options): Advanced options for instructing Oura from which point in the chain to start reading from.
 - [Custom Network](advanced/custom_network): Instructions on how to configure Oura for connecting to a custom network.
 - [Retry Policy](advanced/retry_policy): Instructions on how to configure retry policies for different operations