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.yml

@@ -0,0 +1,28 @@
+image: docker:20.10
+
+include:
+  - local: '.gitlab-ci-template.yml'
+
+stages:
+  - dockerize
+
+variables:
+  CI_REGISTRY_IMAGE: $CI_REGISTRY/$CI_PROJECT_PATH
+  PROJECT_NAME: $CI_PROJECT_NAME
+  TAG: $CI_COMMIT_REF_SLUG
+
+# Main Website
+build_main_website:
+  stage: dockerize
+  extends: .docker-build-template
+  variables:
+    IMAGE_NAME: main-website
+    WORKDIR_PATH: ./main-website
+
+# Demo 1
+build_demo_1:
+  stage: dockerize
+  extends: .docker-build-template
+  variables:
+    IMAGE_NAME: ld1
+    WORKDIR_PATH: ./lawfirm-demos/demo-1