docs: Update README.md for Visual Studio 2026 setup

[VaclavElias]

PR Details

Related Issue

docs: Update README.md for Visual Studio 2026 setup

• Updated the link for Visual Studio 2026 to point to the general
  downloads page instead of the Insiders page.

PR Classification

Documentation update to improve clarity and accuracy.

PR Summary

This pull request updates the README.md file to reflect the latest Visual Studio 2026 details and corrects MSBuild path examples.

• README.md: Updated Visual Studio 2026 link to the general downloads page.
• README.md: Adjusted MSBuild path example to a standard directory structure.
• README.md: Removed outdated note about waiting for Visual Studio Build Tools 2026 release.
• README.md: Improved formatting for clarity, including italicizing "Tools for Visual Studio."

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.

[VaclavElias]

My mistake. Let's reopen.