Documentation improvement: Clean up TabPFN_Demo_Local.ipynb demo notebook

[st--]

Issue

(skipped as this is just a documentation improvement)

Motivation and Context

Clean up the examples notebook (see individual commit messages).

Note that this also syncs the two copies of the notebook in the repository (missed by dc8211f).

Public API Changes

• No Public API changes
• Yes, Public API changes (Details below)

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How Has This Been Tested?

Ran notebook locally.

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Checklist

• The changes have been tested locally.
• [N/A] Documentation has been updated (if the public API or usage changes).
• [N/A] A entry has been added to CHANGELOG.md (if relevant for users).
• The code follows the project's style guidelines.
• [N/A] I have considered the impact of these changes on the public API.

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[gemini-code-assist]

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All committers have signed the CLA.

[robmarkcole]

These notebooks appear to be corrupted

[st--]

Corrupted in what sense? I just double-checked by uploading to Colab, and the setup works all fine for me.