fix(nuxt): avoid duplicate titleTemplate

[harlan-zw]

🔗 Linked issue

Related PR: vueuse/head@1382c43

❓ 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 (VERY MINOR) (fix or feature that would cause existing functionality to change)

📚 Description

When working on #6293, I updated the @vueuse/head package to get the dedupe fix.

In updating, I noticed that all titles had duplicate template processing. For example Home - My Title, became Home - My Title - My Title. This was due to @vueuse/head introducing its own titleTemplate feature.

I figured the best course of action would be to adopt the native titleTemplate logic which, as far as I tested, includes the same feature set.

All seems to work well, however, there is one very minor "breaking" change. In the documentation, it recommended setting titleTemplate to undefined to disable it. This is not possible with these changes, so the doc is updated to use null instead. The @vueuse/head package ignores null values so we need to cast it to an empty string.

📝 Checklist

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

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[pi0]

Thanks!