docs creation still fails, try old statement

.gitlab-ci.yml

@@ -143,7 +143,7 @@ sphinx docs:
     - ./CI/update_badge.sh > /dev/null
   script:
     - cat requirements.txt | cut -f1 -d"#" | sed '/^\s*$/d' | xargs -L 1 pip install
-    - cat docs/requirements_docs.txt | cut -f1 -d"#" | sed '/^\s*$/d' | xargs -L 1 pip install
+    - pip install -r docs/requirements_docs.txt
     - chmod +x ./CI/create_documentation.sh
     - ./CI/create_documentation.sh
   after_script: