fix(highlight): preload common languages

[farnabaz]

🔗 Linked issue

resolves #1265

❓ 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

Treat content.highlight.preload and additional languages and always load 'json', 'js', 'ts', 'css'.

📝 Checklist

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

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[Atinux]

Shall we also load ˋdiff`?

[Atinux]

Also, why do we have to list all preload, cannot we load it on demand?

[farnabaz]

Also, why do we have to list all preload, cannot we load it on demand?

We are dynamically import new languages but Shiki has issue with dynamic loading and it raise error. The issue reported quite while ago but still open. shikijs/shiki#257