Update .gitlab-ci.yml

.gitlab-ci.yml

 image: alpine:latest
 
-stages:
-      - deploy-pages
-
-deploy_pages:
-  stage: deploy-pages
+pages:
+  stage: deploy
   script:
-    - mkdir public
-    - cp -r docs public
+  - echo 'Nothing to do...'
   artifacts:
     paths:
-      - public
+    - public
+    expire_in: 1 day
   only:
-    - deploy-pages
+  - deploy-pages