Pipeline: added install of self for creating the theme

.gitlab-ci.yml

@@ -83,7 +83,7 @@ unit-test-job:   # This job runs in the test stage.
        - tests/**/*
       when: always
 
-pages-job:
+pages:
   script:
     - pip install sphinx sphinx-rtd-theme m2r2 furo
     - pip install -e .