Feature Request: Add Built-in Comment Section Support for Documentation Pages

Is your feature request related to a problem? Please describe.

VitePress-powered static documentation sites currently lack interactive capabilities for reader communication.

Describe the solution you'd like

I propose adding an optional built-in comment section feature with the following design:

1. Provide a simple configuration option in <root>/.vitepress/config.[ext] to enable/disable comments globally or per page.
2. Integrate popular lightweight comment engines (Giscus, Twikoo) as optional providers, with default configurations for quick setup.
3. Support automatic theme adaptation (light/dark mode) and placement control (e.g., after document content).

Describe alternatives you've considered

1. Manual integration of third-party comment tools: Requires customizing theme layouts and handling edge cases like route transitions, which increases maintenance overhead.
2. Building a custom comment component: Duplicates existing mature solutions and risks compatibility issues with future VitePress updates.

Additional context

Comment sections are essential for technical documentation and blogs, as they facilitate knowledge sharing, feedback collection, and community building. Many similar static site generators (e.g., VuePress with comment plugins) already offer this capability, which has become a user expectation for interactive content. A native solution would streamline the workflow for VitePress users while maintaining the tool's simplicity and performance advantages.

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.