Want Waline support

[zhullyb]

I want to create a new issue

• Yes, I have read FAQ.
• Yes, I have read Hexo Docs page, especially Templates, Variables, Helpers and Troubleshooting.
• Yes, I have read Hexo-theme-melody Documentation.
• And yes, I already searched for current issues and this did not help me.

Melody Information

Melody Version: latest

Platform: Linux

Browser: Firefox

Feature Request

Waline is a simple comment system inspired by Valine.
With a backend, we can manage the comment more conveniently.

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[Molunerfinn]

Thanks for your contribution!