Add GitLab CI, Dockerfile, and demo-1

* Configured GitLab CI for Docker image builds and added a Dockerfile with the necessary setup for the main website and demo-1.
* Updated URL and removed duplicate entry in `demos.ts` to resolve conflicts.
* Integrated `.run` configuration for lawfirm-demo1 to streamline local development.

.gitlab-ci-template.yml

@@ -0,0 +1,10 @@
+.docker-login:
+  before_script:
+    - echo "$CI_REGISTRY_PASSWORD" | docker login "$CI_REGISTRY" -u "$CI_REGISTRY_USER" --password-stdin
+
+docker-build-template:
+  image: docker:20.10@sha256:2967f0819c84dd589ed0a023b9d25dcfe7a3c123d5bf784ffbb77edf55335f0c
+  extends: .docker-login
+  script:
+    - docker build --build-arg WORKDIR_PATH=$WORKDIR_PATH -t $CI_REGISTRY_IMAGE/$IMAGE_NAME:$CI_COMMIT_REF_SLUG -f $DOCKERFILE_PATH .
+    - docker push $CI_REGISTRY_IMAGE/$IMAGE_NAME:$CI_COMMIT_REF_SLUG