Remove colabs that use legacy python client

[n-h-diaz]

The packages have been deprecated, so cleaning up old python colabs.

This also restructures the folders to remove the nested v2 folder.

[gemini-code-assist]

Summary of Changes

Hello @n-h-diaz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on maintaining the quality and relevance of the project's Colab notebooks. It addresses the deprecation of an older Python client by removing outdated notebooks and streamlining the directory organization. The primary goal is to ensure that users interact with current and supported examples, improving the overall user experience and reducing maintenance overhead.

Highlights

• Removal of Legacy Colab Notebooks: Deprecated Colab notebooks that utilized an older Python client version have been removed from the repository.
• Folder Restructuring: The v2 subdirectory within notebooks has been eliminated, and its contents have been moved to the parent notebooks directory, simplifying the overall folder structure.
• Documentation Updates: The README.md files have been updated or removed to reflect the changes in notebook availability and directory structure.

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[kmoscoe]

You'll have to make some updates to the docsite as well to change the links to these files: https://docs.datacommons.org/api/python/v2/tutorials.html and https://docs.datacommons.org/courseware/intro_data_science.html