CI: add documentation upload

Note: this shoudl be removed later on as its
purpose is to see the impact of using jupytex
on the documentation

.github/workflows/build_documentation.yml

@@ -87,9 +87,9 @@ jobs:
         run: |
           python doc/print_errors.py
 
-#      - name: Upload Documentation
-#        uses: actions/upload-artifact@v3
-#        with:
-#          name: Documentation
-#          path: doc/_build/html
-#          retention-days: 7
+     - name: Upload Documentation
+       uses: actions/upload-artifact@v3
+       with:
+         name: Documentation
+         path: doc/_build/html
+         retention-days: 7