修复了README文件的链接

[KPCOFGS]

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Description

Changed all the relative links to absolute links for PyPI doc compatibility. Fixed the link that redirect users to the correct contribute markdown file. 将所有相对链接更改为绝对链接以实现 PyPI 文档兼容性

Checklist

Please check the following items before code is ready to be reviewed.

• [x] Code has passed all tests
• [] Docstrings have been added/updated in Google Style
• [x] Documentation has been updated
• [x] Code is ready for review