Update README.md (#3)

- Update README.md (c612edcf8cca59d1fac3374ae6158009b2187629)


Co-authored-by: Sergio Paniego <sergiopaniego@users.noreply.huggingface.co>

README.md

@@ -11,7 +11,7 @@ app_port: 8080
 tags:
   - research-article-template
   - educational paper
-thumbnail: https://HuggingFaceTB-smol-training-playbook.hf.space/thumb.png
+thumbnail: https://huggingface.co/spaces/nanochat-students/transformers/resolve/main/app/src/content/assets/image/nanochat-banner.png
 ---
 <div align="center">