Update CI to deploy webpage

.gitlab-ci.yml

@@ -30,12 +30,14 @@ test-tasks:
     - poetry run pytest tasks/tests/
   
 pages:
-  stage: build-page
+  stage: deploy
   script:
-    - mkdir .public
-    - cp -r website/* .public
+  - echo 'Nothing to do but build a website...'
   artifacts:
     paths:
-      - public
+    - public
+    expire_in: 1 day
   only:
-    - main
\ No newline at end of file
+    - main
+  rules:
+    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH