fix issue in conf.py template

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

@@ -1,5 +1,5 @@
 ---
-environment: public
+environment: internal
 hc_location: api/lts
 html_location: docs/lts/api-ref
 link: /log-tank-service/api-ref/

otc_metadata/data/documents/lts-umn.yaml

@@ -1,5 +1,5 @@
 ---
-environment: public
+environment: internal
 hc_location: usermanual/lts
 html_location: docs/lts/umn
 link: /log-tank-service/umn/

otc_metadata/data/services/lts.yaml

@@ -1,5 +1,5 @@
 ---
-environment: public
+environment: internal
 repositories:
 - environment: internal
   repo: docs-swiss/log-tank-service