Clean up after scope change

[juranki]

• There is now only one adapter, so it should be called adapter here
• There's no longer a separate construct for lambda handler, so artifactPath is not needed in RendererProps here
• Only CDK v2 is supported and there's just one construct, should it be in @sveltekit-cdk/construct instead of @sveltekit-cdk/constructsv2? eh...
• App.render() is now Server.respond(), so RendererProps doesn't fit any more -> ServerProps
• SvelteDistribution -> SvelteKitSite
  • Svelte != SvelteKit
  • the construct is a composition of distribution, function and bucket, so distribution is a bad name for it