use separate host port for chat ui and for app_server (#473)

We were using same port for both chatui and app_server which was causing conflict. This code change updates host port for app_server to 18083 and updates arch_config

demos/samples_python/human_resources_agent/docker-compose.yaml

@@ -9,7 +9,7 @@ services:
     volumes:
       - ./arch_config.yaml:/app/arch_config.yaml
     ports:
-      - "18080:80"
+      - "18083:80"
     healthcheck:
         test: ["CMD", "curl" ,"http://localhost:80/healthz"]
         interval: 5s