Merge branch 'develop' into 'master'

v0.2.2

See merge request !11

.gitlab-ci.yml

 image: boileaum/jupyter
 
+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+
 stages:
   - test
   - deploy

pyproject.toml

 [tool.poetry]
 name = "nbcourse"
-version = "0.2.1"
+version = "0.2.2"
 description = "Create a minisite to publish a course based on Jupyter notebooks"
 authors = ["Matthieu Boileau <matthieu.boileau@math.unistra.fr>"]
 license = "MIT"