Document how to run Airbyte connectors (via Airbyte Serverless) with Pathway inside Docker

[dxtrous]

Is your feature request related to a problem? Please describe.
Airbyte Serverless which is used inside https://pathway.com/developers/api-docs/pathway-io/airbyte relies on Docker.
Dockerizing a Docker app causes Docker in Docker ("DinD") needs a choice of specific setup flags: https://medium.com/@shivam77kushwah/docker-inside-docker-e0483c51cc2c
These are not explained in Pathway documentation, causing questions / confusion.

Describe the solution you'd like
Choose the preferred resolution for DinD.
Mention that dockerization needs special attention (inside pw.io.airbyte docs).
Link to tutorial with this resolution - e.g. include in guide or add to https://pathway.com/developers/showcases/etl-python-airbyte as subsection.

Describe alternatives you've considered
n/a

Additional context
This might also help workaround situations like #13.