✨ feat: add option to show author in post metadata

[welpo]

Summary

Adds show_author configuration option. This will display the authors set on authors = [] in the front matter of the post. If this is not available, it will fall back to author = ""in config.toml.

Related issue

Resolves #319.

Changes

• update page.html to render the author(s) in the metadata
• i18n files updated with new strings to list authors
• format_date.html updated to ensure consistent spacing

Accessibility

Uses semantic HTML.

Screenshots

Type of change

• Bug fix (fixes an issue without altering functionality)
• New feature (adds non-breaking functionality)
• Breaking change (alters existing functionality)
• UI/UX improvement (enhances user interface without altering functionality)
• Refactor (improves code quality without altering functionality)
• Documentation update
• Other (please describe below)

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Checklist

• I have verified the accessibility of my changes
• I have tested all possible scenarios for this change
• I have updated theme.toml with a sane default for the feature
• I have made corresponding changes to the documentation:
  • Updated config.toml comments
  • Updated theme.toml comments
  • Updated "Mastering tabi" post in English
  • (Optional) Updated "Mastering tabi" post in Spanish
  • (Optional) Updated "Mastering tabi" post in Catalan