docs: add export default to default config example

[cngJo]

I noticed the missing export default in the JS file when copying it into my project.

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
TailwindCSS	Edit on Studio ↗︎	View Live Preview	923ab6b

[what-the-diff]

PR Summary

• Configuration Export Modification
  The update made changes to a configuration file. It's now set up to allow other modules to use the tailored configurations straight away. This improves the ease of code reusability.

[ineshbose]

Thanks! I wonder if this should rather be module.exports = instead, but likely
not because Nuxt projects' package.json specify type: module, and Tailwind 3.3 has ESM support so I am okay with this! Thank you again 😃

[cngJo]

https://tailwindcss.nuxtjs.org/tailwind/config#tailwindconfig mentions, that you need to use ESM when not explicitly being in an .cjs file. That's why I used the ESM style in the PR.

You're welcome! And thanks for the instant merge 🎉

[netlify]

‼️ Deploy request for nuxt-tailwindcss rejected.

Name	Link
🔨 Latest commit	923ab6b