Document deploying Prisma with AWS Lambda and Webpack

[matthewmueller]

It's about this issue: prisma/prisma#2303. Might be some details within this too: #1471. It looks like the Lambda + Webpack issue didn't actually get documented last go around.

(Talk to @millsp for more context, feel free to edit this with details)

[d3r3nic]

https://www.prisma.io/docs/guides/deployment/deployment-guides/deploying-to-aws-lambda

[ruheni]

This is currently documented here: https://www.prisma.io/docs/guides/deployment/deployment-guides/use-prisma-with-serverless-framework (using webpack and the serverless framework)