Add docs for submodules

.gitlab-ci.yml

@@ -97,6 +97,7 @@ twine-job:
 pages:
   stage: deploy
   script:
+    - git submodule sync && git submodule update
     - make docs # Build documentation
     - for branch in devel master release; do curl -L --header "JOB-TOKEN:$CI_JOB_TOKEN" "$CI_API_V4_URL/projects/$CI_PROJECT_ID/jobs/artifacts/$branch/download?job=pages" -o $branch.zip; done # Download the documentation from devel, master and release branches
     - unzip -o '*.zip' || true # Unzip downloaded documentation while ignoring not existing files

Makefile

@@ -223,7 +223,7 @@ deps-vagrant: deps-prerequisites deps-runenv deps-python-dev deps-python deps-ed
 
 clean: clean-pycs clean-build-docs clean-build-python clean-build-debian
 
-docs: docs-sphinx
+docs: docs-sync docs-sphinx
 
 check: pyflakes pylint test