Delete .gitlab-ci-yml

lib/.gitlab-ci-yml

-image: cirrusci/flutter:stable
-
-stages:
-  - build
-  - deploy
-
-build:
-  stage: build
-  script:
-    - flutter config --enable-web
-    - flutter build web --release
-  artifacts:
-    paths:
-      - build/web
-
-pages:
-  stage: deploy
-  script:
-    - mv build/web public
-  artifacts:
-    paths:
-      - public
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