Open in Google Colab button

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Add link/button to open the original notebook in Google Colab

https://colab.research.google.com/github/user/repo/blob/branch/path/to/notebook.ipynb

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LangChain example

https://python.langchain.com/docs/tutorials/llm_chain/

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https://github.com/langchain-ai/langchain/blob/4419340039c98da45c13675340e853801dfc0f8b/docs/src/theme/DocItem/Layout/index.js#L41C3-L81C5