Adding :prefetch="true|false" to all links

[Guito]

As seen in https://nuxtjs.org/api/components-nuxt-link/, prefetch can be enabled or disabled using the prefetch attribute.

Currently we only have no-prefetch, however, this is not enough if you want to disable prefetching globally and only having it locally (You can disable the global prefetching with: router.prefetchLinks: false)

[tmorehouse]

This would need to be a true, false or null prop (tri-state) where null means to use the global Nuxt setting.

[Guito]

Hello @tmorehouse,

Can I help implementing this? Is there any guide to start developing for the module?