Apply APA 7th edition title case to site-cc headings

[lemur47]

Summary

• Converted 23 H2 headings across all 5 site-cc content pages from sentence case to APA 7th edition title case
• No changes needed for site/ (.dev) — headings already compliant
• H1 titles (frontmatter) and H3+ headings were already correct

APA 7th rules applied

• Major words (nouns, verbs, adjectives, adverbs, pronouns) capitalised regardless of length
• Minor words of three or fewer letters (to, in) kept lowercase unless first word or verb
• Both parts of hyphenated compounds capitalised (e.g. "Fact-Checking", "Open-Source")

Test plan

• Pre-commit hooks pass (astro check, npm audit for site-cc)
• Verify headings render correctly on site-cc pages

🤖 Generated with Claude Code

[cloudflare-workers-and-pages]

Deploying si-protocols with    Cloudflare Pages

Latest commit:	7eee913
Status:	✅  Deploy successful!
Preview URL:	https://35df8dd2.si-protocols.pages.dev
Branch Preview URL:	https://feature-apa-heading-capitali.si-protocols.pages.dev

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[cloudflare-workers-and-pages]

Deploying si-protocols-cc with    Cloudflare Pages

Latest commit:	7eee913
Status:	✅  Deploy successful!
Preview URL:	https://65253a79.si-protocols-cc.pages.dev
Branch Preview URL:	https://feature-apa-heading-capitali.si-protocols-cc.pages.dev

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