add nitro 3 fixture - fix landing page build

[atilafassina]

we have been consuming start and the nitro plugin from /src, this PR changes the exports in the start package so it can also be consumed from /dist.

it also adds a dedicated fixture for Nitro v3

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Latest commit: 353f677

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commit: 353f677

[brenelz]

Nice work here. One conflict to resolve