feat(nuxt): add stubs for useNuxtApp and NuxtLink

[danielroe]

Description

#286 (comment)

This adds stubs for NuxtLink and useNuxtApp (and hopefully an easy template for how to add other stubbed nuxt components/composables).

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Ideally, include relevant tests that fail without this PR but pass with it.

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