Add body configuration items to gitalk configuration to support custom issue content# Utterances

[tootscharlie]

PR Checklist

• The changes have been tested (for bug fixes / features).
• Docs in NexT website have been added / updated (for features).

Docs PR: next-theme/theme-next-docs#138

PR Type

• Bugfix.
• Feature.
• Improvement.
• Code style update (e.g. formatting, linting).
• Refactoring (no changes to functionality and APIs).
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Custom gitalk issue body is currently not supported

What is the new behavior?

gitalk config add body config item, add custom issue body configuration.

• Link to demo site with this changes: None
• Screenshots with this changes: None

How to use?

In NexT _config.yml:

gitalk:
  // omit other configuration..
  # If you want to customize the content of the initialized Issue, please edit the body parameters. support line breaks via `|`.
  # Sample configuration: ${document.title}` or `${location.href}
  body: |
    **Article title**: [${document.title}](${location.href})
    **Customized content**: This is my customized Issue body in Gitalk. Comments and exchanges are welcome!

[welcome]

Thanks so much for opening your first PR here!

[github-actions]

This pull request contains changes to the configuration file. Please make sure the documentation in NexT website is changed or added.
Please edit relevant source files here: https://github.com/next-theme/theme-next-docs/tree/master/source/docs and create a pull request with the changes here: https://github.com/next-theme/theme-next-docs/pulls