Update Hugo.gitlab-ci.yml

The previous docker image used Hugo 0.54 and is no longer compatible
with a number of themes.
Signed-off-by: Paul Spooren <mail@aparcar.org>

lib/gitlab/ci/templates/Pages/Hugo.gitlab-ci.yml

-# Full project: https://gitlab.com/pages/hugo
-image: dettmering/hugo-build
+---
+# All available Hugo versions are listed here:
+# https://gitlab.com/pages/hugo/container_registry
+image: registry.gitlab.com/pages/hugo:latest
+
+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+
+test:
+  script:
+    - hugo
+  except:
+    - master
 
 pages:
   script:
@@ -9,9 +20,3 @@ pages:
       - public
   only:
     - master
-
-test:
-  script:
-    - hugo
-  except:
-    - master