CI 404s test

.gitlab-ci.yml

@@ -53,7 +53,7 @@ ext_links:
   - virtualenv venv
   - source venv/bin/activate
   - pip install -r requirements.txt
-  - mkdocs serve
+  - "mkdocs serve &"
   script:
   - wget --spider -o /tmp/wget.log -e robots=off  -r -p http://127.0.0.1:8000
   - sed -n '/^Found .* broken links.$/,$p' /tmp/wget.log