Add copyright when copying

[799953468]

PR Checklist

• The commit message follows guidelines for NexT.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for features).

PR Type

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Issue resolved:

What is the new behavior?

• Link to demo site with this changes:
• Screenshots with this changes:

How to use?

In NexT _config.yml:

post_copyright:
  enable: true 
  maxLength: 10 # Trigger length

[stevenjoezhang]

This proposal was once rejected because it would affect the reader's reading experience. I think it is more suitable as a NexT plug-in. See theme-next/hexo-theme-next#1325

[799953468]

这个提议一度遭到拒绝，因为它会影响读者的阅读体验。我认为它更适合作为 NexT 插件。请参阅主题-下一个/下一个主题-下一个#1325

ok