Fix README.md notebook links (#976)

# What does this PR do?

In short, provide a summary of what this PR does and why. Usually, the
relevant context should be present in a linked issue.

- [ ] Addresses issue (#issue)


## Test Plan

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 - tests you ran to verify your changes with result summaries.
 - provide instructions so it can be reproduced.


## Sources

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## Before submitting

- [x] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [x] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

Signed-off-by: Aakanksha Duggal <aduggal@redhat.com>

docs/readme.md

@@ -6,6 +6,6 @@ Here's a collection of comprehensive guides, examples, and resources for buildin
 
 Try out Llama Stack's capabilities through our detailed Jupyter notebooks:
 
-* [Building AI Applications Notebook](./notebooks/Llama_Stack_Building_AI_Applications.ipynb) - A comprehensive guide to building production-ready AI applications using Llama Stack
+* [Building AI Applications Notebook](./getting_started.ipynb) - A comprehensive guide to building production-ready AI applications using Llama Stack
 * [Benchmark Evaluations Notebook](./notebooks/Llama_Stack_Benchmark_Evals.ipynb) - Detailed performance evaluations and benchmarking results
-* [Zero-to-Hero Guide](./notebooks/Llama_Stack_Zero_to_Hero_Guide.ipynb) - Step-by-step guide for getting started with Llama Stack
+* [Zero-to-Hero Guide](./zero_to_hero_guide) - Step-by-step guide for getting started with Llama Stack