Fix incorrect documentation URLs in README.md and install.sh

[Copilot]

Problem

The repository contained outdated documentation URLs pointing to sillytavern.rnsv.xyz which are no longer valid:

• README.md referenced https://sillytavern.rnsv.xyz/editor
• install.sh referenced https://sillytavern.rnsv.xyz/basics/editor

Solution

Updated both files to use the correct documentation URL as provided.

Files Changed

• README.md: Updated documentation link on line 61
• install.sh: Updated documentation link on line 49

Testing

• Verified no other references to the old domain exist in the codebase
• Confirmed the new URL is accessible and points to the correct documentation

This ensures users get directed to the correct documentation when using the auto-installer script or reading the README.

This pull request was created as a result of the following prompt from Copilot chat.

Update the README.md file in the repository to replace the incorrect documentation URL 'https://sillytavern.rnsv.xyz/basics/editor' with the correct URL provided by the user. Ensure there are no other outdated references to the incorrect link in the README.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.