Add version string

Also, add gitlab CI file.

.gitlab-ci.yml

@@ -0,0 +1,18 @@
+image: alpine:latest
+pages: # the job must be named pages
+  image: node:latest
+  stage: deploy
+  before_script:
+    # - ./update_version.sh
+    - echo $CI_COMMIT_TIMESTAMP $CI_COMMIT_SHORT_SHA > src/assets/version.txt
+    - npm install -g workbox-cli
+  script:
+    - npm ci
+    - npm run build
+    - mv public public-vue # GitLab Pages hooks on the public folder
+    - mv dist public # rename the dist folder (result of npm run build)
+  artifacts:
+    paths:
+      - public # artifact path must be /public for GitLab Pages to pick it up
+  only:
+    - main