Dead link to `type-annotator-scanner/README.md` in README


<img width="849" alt="Image" src="https://github.com/user-attachments/assets/2130eb17-3aef-4a50-a449-a4cc6e74fda8" />

The link points to `https://github.com/ucr-riple/NullAwayAnnotator/blob/type-annotator-scanner/README.md` which doesn't exist ☹ 

<img width="471" alt="Image" src="https://github.com/user-attachments/assets/6baa997a-b396-48b6-ab7f-fc2d3ddc67f6" />