🐛 fix(header): render feed links based on config

[welpo]

Summary

This PR fixes a bug where feed links were being rendered in the header even when feeds were disabled. It introduces a more flexible and robust solution for handling feed links in the header template.

Related issue

Fixes #352.

Changes

• Modified header.html to conditionally render feed links
• Added support for multiple feed types (Atom and RSS)
• Improved code to use config.feed_filenames for Zola 0.19.x and newer, falling back to config.feed_filename for older versions

Accessibility

Unaffected.

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

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