aws-cdk-lib.pipelines: add link to docker drop-in replacements from developer guide to learn more

[evzzk]

Describe the issue

We should link to How to replace Docker with another container management tool from the CDK developer guide.

Links

https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.pipelines-readme.html#:~:text=cloud%20assembly%20versions.-,Using%20Drop%2Din%20Docker%20Replacements,-By%20default%2C%20the

[pahud]

Thank you @evzzk !

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