chore: migrate `@nuxt/eslint-config` from `v0.1` to `v0.3`

[shinGangan]

🔗 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)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [x] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

migrating @nuxt/eslint-config from v0.1.1 to v0.3.0. In addition, fix lint error.

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[shinGangan]

Hello @Gugustinette , please review when you have a time 🙏

[Gugustinette]

I handled everything here : https://github.com/nuxt-modules/leaflet/pull/36

So this is no longer necessary, but I used your config file thanks 👍

[shinGangan]

I was busy overwhelmed, so thank you for taking care of it! 🙏

@Gugustinette