add gitea repo for Internal documentation

otc_metadata/data/services/intdocs.yaml

@@ -0,0 +1,13 @@
+---
+environment: internal
+repositories:
+- environment: internal
+  repo: docs/internal-documentation
+  type: gitea
+service_category: other
+service_title: Internal Documentation
+service_type: intdocs
+service_uri: internal-documentation
+teams:
+- name: docs-eco-rw
+  permission: write