Substantial reorganization of notebooks with consistent formatting

[slowvak]

Summary

• Fixed Colab badge URLs in 15 notebooks that pointed to old/renamed filenames
• Added missing Colab badges to 7 notebooks
• Standardized header structure across all 31 notebooks: badge → author → ## **Title** → ### **Section**
• Fixed author/title ordering in notebooks where they were swapped
• Removed a Hugging Face API token that was accidentally left in a cell output in 17A.ipynb

Test plan

• Spot-check several notebooks in Colab to confirm badge links open correctly
• Verify author names, titles, and section headers render properly
• Confirm no secrets remain in any notebook outputs

🤖 Generated with Claude Code

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