feat: add Dockerfile, docker-compose.yml, and nginx.conf for containerized deployment

nest-intra/nginx.conf

@@ -0,0 +1,9 @@
+server {
+    listen 5174;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}