Update README.md with contributors.png (#8820)

* Update README.md with contributors.png

Replace dynamic svg from opencollective with static png for improved stability and lighter size (400kB vs 2MB).

@AyushExel

* Update README.md

* Update README.md

* Update README_cn.md

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/README_cn.md

@@ -249,7 +249,9 @@ We are super excited about our first-ever Ultralytics YOLOv5 🚀 EXPORT Competi
 ## <div align="center">贡献</div>
 
 我们重视您的意见! 我们希望给大家提供尽可能的简单和透明的方式对 YOLOv5 做出贡献。开始之前请先点击并查看我们的 [贡献指南](CONTRIBUTING.md)，填写[YOLOv5调查问卷](https://ultralytics.com/survey?utm_source=github&utm_medium=social&utm_campaign=Survey) 来向我们发送您的经验反馈。真诚感谢我们所有的贡献者!
-<a href="https://github.com/ultralytics/yolov5/graphs/contributors"><img src="https://opencollective.com/ultralytics/contributors.svg?width=990" /></a>
+
+<!-- SVG image from https://opencollective.com/ultralytics/contributors.svg?width=990 -->
+<a href="https://github.com/ultralytics/yolov5/graphs/contributors"><img src="https://github.com/ultralytics/yolov5/releases/download/v1.0/image-contributors-1280.png" /></a>
 
 ## <div align="center">联系</div>