Fix badge link (#3133)

### Changes

Fix link  in badge 

### Reason for changes

Deprecation
docs.openvino.ai/latest/openvino_docs_model_optimization_guide.html

Author: AlexanderDokuchaev

README.md

@@ -11,7 +11,7 @@
 [Model Zoo](./docs/ModelZoo.md)
 
 [![GitHub Release](https://img.shields.io/github/v/release/openvinotoolkit/nncf?color=green)](https://github.com/openvinotoolkit/nncf/releases)
-[![Website](https://img.shields.io/website?up_color=blue&up_message=docs&url=https%3A%2F%2Fdocs.openvino.ai%2Flatest%2Fopenvino_docs_model_optimization_guide.html)](https://docs.openvino.ai/nncf)
+[![Website](https://img.shields.io/website?up_color=blue&up_message=docs&url=https%3A%2F%2Fdocs.openvino.ai%2Fnncf)](https://docs.openvino.ai/nncf)
 [![Apache License Version 2.0](https://img.shields.io/badge/license-Apache_2.0-green.svg)](LICENSE)
 [![PyPI Downloads](https://static.pepy.tech/badge/nncf)](https://pypi.org/project/nncf/)