Update README: replace docs link to avoid risk from expired domain

[kelvin27315]

Summary

The documentation URL in the README pointed to a domain that is currently listed for sale.
The actual documentation appears to be hosted on GitHub Pages, and continuing to reference the expired domain may pose a security risk.

This PR updates the link to point directly to the correct GitHub Pages URL to avoid any potential confusion or misuse.

Motivation

• The old domain is no longer controlled by the project and is currently for sale.
• There is a risk that the domain could be acquired by a third party and used maliciously (e.g., phishing).
• Updating the URL helps maintain trust and accuracy in the project documentation.