docs: use @vercel/static-build instead of @now/static

[amondnet]

Signed-off-by: Minsu Lee amond@amond.net

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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Deploy preview for zeit-now-deployment-action-example-static ready!

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Deploy preview for zeit-now-deployment-action-example-angular ready!

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