Update CHANGELOG and documentation for version 0.6.1rc

[M-Nikox]

This pull request updates the changelog to document the upcoming 0.6.1rc release. It highlights improvements to documentation, dependency and security maintenance, and several dependency version bumps.

Most important changes:

Documentation Improvements

• Added coverage for Template Mode (including default format, tokens, and usage) across the README, Getting Started, and FAQ.

Dependency and Security Maintenance

• Performed dependency and security maintenance to stabilize Dependabot updates, including a secure esbuild override path.
• Updated dependencies:
  • vite from 8.0.12 to 8.0.16
  • undici in lockfile from 7.25.0 to 7.28.0 and 6.25.0 to 6.27.0
  • form-data from 4.0.5 to 4.0.6
  • tar from 7.5.15 to 7.5.16
  • js-yaml from 4.1.1 to 4.2.0
• Pulled inUpdated documentation and dependencies for version 0.6.1rc, including security fixes and improvements.

[Copilot]

Pull request overview

Updates CHANGELOG.md to add release notes for the upcoming 0.6.1rc release, summarizing recent documentation improvements and dependency/security maintenance for Slate.

Changes:

• Added a new 0.6.1rc changelog section with “Changed” and “Security” notes.
• Documented dependency version bumps (Vite, undici, form-data, tar, js-yaml) and Dependabot/esbuild remediation work.

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