remove DIS documentation from portal

Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Michal Kacur <michal.kacur@t-systems.com>
Co-committed-by: Michal Kacur <michal.kacur@t-systems.com>

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

@@ -1,13 +0,0 @@
----
-hc_location: api/dis
-html_location: docs/dis/api-ref
-link: /data-ingestion-service/api-ref/
-rst_location: api-ref/source
-service_type: dis
-title: API Reference
-type: api-ref
-cloud_environments:
-  - name: eu_de
-    visibility: public
-    pdf_visibility: public
-    pdf_enabled: true

otc_metadata/data/documents/dis-umn.yaml

@@ -1,13 +0,0 @@
----
-hc_location: usermanual/dis
-html_location: docs/dis/umn
-link: /data-ingestion-service/umn/
-rst_location: umn/source
-service_type: dis
-title: User Guide
-type: umn
-cloud_environments:
-  - name: eu_de
-    visibility: public
-    pdf_visibility: public
-    pdf_enabled: true