docs: add lesson audio overview via NotebookLM

[PTharanan]

Accessibility & Performance Improvements:

• Added an external link to the 30MB lesson audio hosted on NotebookLM.
• Optimized README for faster loading by avoiding large file uploads.
• Enhanced accessibility for learners who prefer audio-based instruction.

[github-actions]

👋 Thanks for contributing @PTharanan! We will review the pull request and get back to you soon.

[Copilot]

Pull request overview

Adds an audio-learning entry point to the Tamil translation of Lesson 01 by linking to externally hosted NotebookLM audio, aligning with the PR goal of improving accessibility while avoiding large in-repo media files.

Changes:

• Added a new “audio learning” section with an external NotebookLM link near the top of the lesson README.
• Adjusted the translation disclaimer formatting at the bottom (removing unintended indentation).

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[PTharanan]

@koreyspace Hi! I have updated the README with the NotebookLM audio description. Could you please review and approve this PR?

[leestott]

We only except changes to the primary english content as all translations are autocompleted please only reference native jupyter notebooks not hosted notebooks