Document serverless deployment (as aws lambda)

[demeringo]

Problem

API can be deployed as aws lambda but it is not described in the doc.

Solution

1. verify that the serverless deployment stills works OK (not tested in a while....)
2. Add a paragraph in the deploy section of documentation:
   https://doc.api.boavizta.org/Reference/deploy/

Alternatives

Additional context or elements

[demeringo]

A quick test shows that existing serverless config does not deploy anymore 😢

Seems related to the size of un-zippped python deps > 250 MB (which is default lambda limit).

An alternative for a quick workaround could be to deploy a docker image to lambda.
See:

• https://www.serverless.com/blog/container-support-for-lambda
• https://appliedaiconsulting.com/how-to-deploy-lambda-container-image-using-serverless-framework/

If confirmed I'll move it to it's own issue.