Update the citation information: webpage, github repo

[pengzhenghao]

@article{li2023scenarionet,
  title={ScenarioNet: Open-Source Platform for Large-Scale Traffic Scenario Simulation and Modeling},
  author={Li, Quanyi and Peng, Zhenghao and Feng, Lan and Liu, Zhizheng and Duan, Chenda and Mo, Wenjie and Zhou, Bolei},
  journal={Advances in Neural Information Processing Systems},
  year={2023}
}