Feat: Support for gitalk system configuration parameter to manually c…

[ShijayHuo]

…reate issue

PR Checklist

• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• The commit message follows guidelines for NexT.
• 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).
• Build & CI related changes.
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Issue resolved: N/A

What is the new behavior?

• Screenshots with this changes: N/A
• Link to demo site with this changes: N/A

How to use?

In NexT _config.yml:

create_issue_manually: true | false # Manually create issue, please refer to https://github.com/gitalk/gitalk/issues/440 for details

[welcome]

Thanks so much for opening your first PR here!