Add pdf environment switch

Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: tischrei <tino.schreiber@t-systems.com>
Co-committed-by: tischrei <tino.schreiber@t-systems.com>

otc_metadata/data/documents/ed-api-ref.yaml

@@ -1,6 +1,8 @@
 ---
 link: /enterprise-dashboard/api-ref/
 rst_location: api-ref/source
+pdf_enabled: false
+pdf_environment: hidden
 service_type: ed
 title: API Reference
 type: api-ref