README.md: use PyPI for installation instead of JFrog (#14)

- README.md: use PyPI for installation instead of JFrog (b8b100d06ebc73c7e7c92de8bc53fa16754515c9)

README.md

@@ -124,11 +124,7 @@ To work with our models just run these lines in your terminal:
 
 ```shell
 pip install thestage
-pip install elastic_models[nvidia]\
- --index-url https://thestage.jfrog.io/artifactory/api/pypi/pypi-thestage-ai-production/simple\
- --extra-index-url https://pypi.nvidia.com\
- --extra-index-url https://pypi.org/simple
-
+pip install 'thestage-elastic-models[nvidia]'
 pip install flash_attn==2.7.3 --no-build-isolation
 pip uninstall apex
 ```