* Change to 'pip install .. --extra-index-url' for readthedocs
* Change to 'pip install .. --extra-index-url' for examples
* Change to 'pip install .. --extra-index-url' for remaining files
* Fix URL for ipex
* Add links for ipex US and CN servers
* Update ipex cpu url
* remove readme
* Update for github actions
* Update for dockerfiles
* Add CPU and GPU examples of phi-2
* In GPU hf example, updated the readme for Windows GPU supports
* In GPU torch example, updated the readme for Windows GPU supports
* update the table in BigDL/README.md
* update the table in BigDL/python/llm/README.md