Update README and add GitLab CI/CD configuration for automatic deployment

.gitlab-ci.yml

@@ -0,0 +1,20 @@
+# GitLab CI/CD configuration for GitLab Pages
+pages:
+  stage: deploy
+  script:
+    # Create the public directory (GitLab Pages serves from this directory)
+    - mkdir -p public
+
+    # Copy all necessary files to the public directory
+    - cp index.html public/
+    - cp script.js public/
+    - cp styles.css public/
+    - cp *.svg public/
+
+    # Print deployment info
+    - echo "Deploying theme switcher to GitLab Pages..."
+  artifacts:
+    paths:
+      - public
+  only:
+    - main  # This job will only run on the main branch