Update .gitlab-ci.yml file:

- remove unused files

.gitlab-ci.yml

@@ -25,9 +25,9 @@ release_job:
     image: registry.gitlab.com/gitlab-org/release-cli:latest
     script:
         - echo "Release WPE 2.0_$CI_COMMIT_SHORT_SHA"
-        # - rm .gitlab-ci.yml
-        # - rm CHANGELOG
-        # - rm README.md
+        - rm .gitlab-ci.yml
+        - rm CHANGELOG
+        - rm README.md
 
     release:
         tag_name: $CI_COMMIT_SHORT_SHA