🐛 fix(footer): show feed icon on Zola 0.19.0

[welpo]

Summary

Updates the footer template to work with Zola 0.19.0. Note: if you are using two feeds, only the first one from feed_filenames will be linked on the footer.

Related issue

Fixes #335

Type of change

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

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