S3Origin Is On Deprecation Path

[coltenkrauter]

I observed this warning while deploying,

Warning:  aws-cdk-lib.aws_cloudfront_origins.S3Origin is deprecated.
  Use `S3BucketOrigin` or `S3StaticWebsiteOrigin` instead.
  This API will be removed in the next major release.

Here is where it is in this code: src/nextjs-distribution.ts#L176-L178.

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[bestickley]

@coltenkrauter, thanks the raising this. I'll be handling this in my next PR.