docs: update repository links and citation details

Update GitHub repository links from placeholder 'your-org' to 'SourceShift'
in CONTRIBUTING.md and README.md. This ensures all references point to
the correct organization. Also, update the BibTeX citation in README.md
to include the author's name and the correct publication year (2025),
and update its URL to match the new organization. This provides accurate
citation information.

Author: amirkhakshour

CONTRIBUTING.md

@@ -342,7 +342,7 @@ We use these labels to categorize contributions:
 
 ### Community
 
-- [GitHub Discussions](https://github.com/your-org/tpu-engineering-book/discussions)
+- [GitHub Discussions](https://github.com/SourceShift/TPU_Engineering_book/discussions)
 - [JAX Community](https://github.com/google/jax/discussions)
 - [TPU Users Group](https://groups.google.com/g/cloud-tpu-users)
 

README.md

@@ -115,7 +115,7 @@ This book provides a complete, production-ready guide to TPU engineering for mod
 
 ```bash
 # Clone the repository
-git clone https://github.com/your-org/tpu-engineering-book.git
+git clone https://github.com/SourceShift/TPU_Engineering_book.git
 cd tpu-engineering-book
 
 # Set up Python environment
@@ -331,10 +331,10 @@ If you use this book in your research or work, please cite:
 ```bibtex
 @book{tpu_engineering_2024,
   title={TPU Engineering for LLM Production Systems: The Definitive Guide},
-  author={[Author Names]},
-  year={2024},
+  author={[Amir Khakshour]},
+  year={2025},
   publisher={Open Source},
-  url={https://github.com/your-org/tpu-engineering-book}
+  url={https://github.com/SourceShift/TPU_Engineering_book}
 }
 ```