Merge branch '42-change-the-ci-to-be-more-strict-on-error-and-warnings' into '1.3'

Resolve "change the ci to be more strict on error and warnings"

Closes #42

See merge request fusiondirectory/dev-manual!65

.gitlab-ci.yml

@@ -17,6 +17,6 @@ create_sphinx_rapport:
     - branches
     - tags
   script:
-    - make html
+    - make SPHINXOPTS='-n -W' html