fix(404): exclude sitemap-disabled pages from 404 suggestions

[srgg]

Previously, pages with sitemap.disable=true were shown in 404 suggestions. This change filters them out for consistency and better UX.

🚀 What type of change is this?

• 🐛 Bug fix (A non-breaking change that fixes an issue)
• ✨ New feature (A non-breaking change that adds functionality)
• 💅 Style change (A change that only affects formatting, visuals, or styling)
• 📚 Documentation update (Changes to documentation only)
• 🧹 Refactor or chore (A code change that neither fixes a bug nor adds a feature)
• 💥 Breaking change (A fix or feature that would cause existing functionality to not work as expected)

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🎯 What is the purpose of this change?

This change updates the 404 page layout to respect frontmatter flags, such as 1sitemap.disable1, ensuring that hidden or excluded pages do not appear in 404 suggestions. It improves consistency with the sitemap, prevents accidental exposure of private content, and provides a cleaner user experience.

📸 Screenshots or Screencast (if applicable)

Not applicable

ℹ️ Documentation Check

• [ x] No, this change does not require a documentation update.
• Yes, I have updated the documentation accordingly (or will in a follow-up PR).

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[github-actions]

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Awesome work, we'll take a look soon! ✨

[gcushen]

Thanks for the PRs and for identifying that private pages can leak into the RSS feed - that's a real gap we'll fix.

However, HugoBlox uses its own private: true frontmatter param (rather than Hugo's newly added sitemap.disable inspired by private) to control page visibility across all surfaces (sitemap, RSS, 404 suggestions, search engine indexing). This is by design - it's a simpler, flatter param that's more intuitive for our audience.

We'll fix the RSS feed to respect private (which was missing). Supporting Hugo's suggested sitemap.disable as an additional mechanism would be a new feature rather than a bug fix, and we'd want to evaluate that separately as that would add unnecessary bloat and confusion for our community.