Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -15,6 +15,8 @@ pages:
   before_script:
   - pip install mkdocs
   - pip install https://github.com/mkdocs/mkdocs-bootswatch/archive/master.zip
+  - pip3 install --upgrade pip
+  - pip3 install jupyter
   script:
   - mkdocs build 
   - mv site public