Added sustainability to ED

otc_metadata/data/documents/ed-sustainability.yaml

@@ -0,0 +1,11 @@
+---
+link: /enterprise-dashboard/sustainability/
+rst_location: doc/sustainability/source
+service_type: ed
+title: Sustainability
+type: sustainability
+cloud_environments:
+  - name: eu_de
+    visibility: hidden
+    pdf_visibility: hidden
+    pdf_enabled: true