docs: add documentation for titleTemplate

[entity]

🔗 Linked issue

nuxt/nuxt#13981 (And #5057 for PR)

❓ 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

This change adds more clarity to the titleTemplate option, as currently in Nuxt 3 this doesn't work as intended. This resolvesnuxt/nuxt#13981. This is a re-added PR to #5057, accidentally deleted the repo when adding multiple PRs to Nuxt.

Some changes were resolved by @manniL, @danielroe and @DamianGlowala.

📝 Checklist

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

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[atinux]

Thanks @heychazza

I would suggest to document it to be used in app.vue instead of creating a plugin for it. Otherwise changes look good to me!

[danielroe]

Yes, please see my suggested changes on the previous PR.

[entity]

Thanks @heychazza

I would suggest to document it to be used in app.vue instead of creating a plugin for it. Otherwise changes look good to me!

Thank you lots! Daniel did mention this but I completely overlooked it.

Will add those changes tomorrow once I'm at the computer.