Fix README.md documentation link

Author: ProfLander

README.md

@@ -2,7 +2,7 @@
 
 # `rust-gpu-builder`
 
-[![Documentation](https://img.shields.io/badge/docs-API-blue)](https://bevy-rust-gpu.github.io/bevy-rust-gpu/rust-gpu-builder/)
+[![Documentation](https://img.shields.io/badge/docs-API-blue)](https://bevy-rust-gpu.github.io/rust-gpu-builder/)
 
 `rust-gpu` helper program for automating shader crate compilation.