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.

main-website/app/data/demos.ts

@@ -14,7 +14,7 @@ export const demoCategories = [
             },
             {
                 name: 'Anwaltskanzlei Demo 2',
-                url: 'http://localhost:5102',
+                url: 'http://localhost:5101',
                 preview: '/previews/lawfirm-1.png',
                 description: [
                     'Modernes Design',
@@ -23,18 +23,6 @@ export const demoCategories = [
                     'Optimiert für Rechtsanwälte 1',
                 ],
             },
-            {
-                name: 'Anwaltskanzlei Demo 2',
-                url: 'http://localhost:5102',
-                preview: '/previews/lawfirm-1.png',
-                description: [
-                    'Modernes Design',
-                    'Dunkles Layout',
-                    'Optimiert für Rechtsanwälte',
-                    'Optimiert für Rechtsanwälte 2',
-                    'Optimiert für Rechtsanwälte 3',
-                ],
-            },
         ],
     },
     {