fix(nuxt): add additional sections of nuxt vite config

[danielroe]

Description

This adds a couple of extra sections of the Nuxt vite config, particularly the define section which will replace process.dev, process.server, process.client, etc., which are frequently used in Nuxt projects.

Additional context

This partially addresses #107, but we now still have a missing RouterLink that either needs to be stubbed or imported:

The following is the minimal RouterLink implemented by Nuxt when vue-router is not present:

const RouterLink = {
  functional: true,
  props: { to: String },
  setup: (props, { slots }) => () => h('a', { href: props.to, onClick: (e) => { e.preventDefault(); router.push(props.to) } }, slots)
}

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Pull Request Guidelines and follow the Commit Convention.
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• Ideally, include relevant tests that fail without this PR but pass with it.

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