added gitlab pages support

.gitlab-ci.yml

 # The Docker image that will be used to build your app
 image: node:lts
+# Functions that should be executed before the build script is run
+before_script:
+  - npm i
+pages:
+  script:
+    - npm run deploy
+  artifacts:
+    paths:
+      # The folder that contains the files to be exposed at the Page URL
+      - public
+  rules:
+    # This ensures that only pushes to the default branch will trigger
+    # a pages deploy
+    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH