Document using Martin as a AWS Lambda using PMTiles on S3, or another cloud provider

We urgently need anyone with the AWS Lambda experience to write a short documentation on how to use Martin with Amazon Lambda functions, or similar tech with other cloud providers. The tiles data should be placed on an AWS bucket, with public access. Martin does not support S3 authentication yet, PRs welcome. Note that the bucket URL should not be publicized - rather it should simply be used by the Lambda function, which provides adequate protection from malicious users who may want to download large data directly, thus raising hosting costs.

The markdown doc file would go into https://github.com/maplibre/martin/tree/main/docs/src