docs: ensure consistent casing of section headers

[DamianGlowala]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Knock knock, case police, let's make the case consistent, PLEASE! ;)

• General inspiration for introducing consistency across the headers came from the Vue.js documentation.
• Whenever in doubt, I followed the Wikipedia Manual of Style available as one of the options at https://capitalizemytitle.com/style/Wiki.
• PR also includes other minor stylistic tweaks.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[danielroe]

Love it! Consistency is important. Though my own personal preference is not to use title case but only capitalise first word - wdyt @pi0@atinux@antfu?

[pi0]

I personally (Usually) capitalize titles to emphasize on keywords but not always but totally fine to keep the first start case as the convention.

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[antfu]

I don't have a strong opinion either. But This PR looks good to me as I suppose the title case is consistent and easy to follow.

[atinux]

It looks good to me to have this consistency for headings 😊

[pi0]

What if we make an exception for non-keywords such as "to", "for", "with", etc to be lower cases?

[antfu]

What if we make an exception for non-keywords such as "to", "for", "with", etc to be lower cases?

From my understanding, conjunctions should be lowercase already in the title.

[pi0]

Thanks, @DamianGlowala <3 I've done a check and all titles seem now valid with APA Style (using this tool. It would be nice if we could make this process automated to avoid inconsistencies in the future (tracker: nuxt/nuxt#14566)