Update docs to reference graphql-yoga

[rahrang]

@graphql-yoga/node is deprecated (see here on npm).
graphql-yoga is the suggested replacement. The Pothos example in the graphql-yoga docs also use graphql-yoga.

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Name	Status	Preview	Updated
pothos	✅ Ready (Inspect)	Visit Preview	Nov 18, 2022 at 6:05AM (UTC)

[hayes]

Thanks for the PR, there is an existing PR for this here: #670 with some additional changes. There is currently still a type issue preventing that PR from being merged, but we should have the docs updated soon.

[hayes]

docs have been updated!