The .MD file in the repository is your best bet but Bitbucket (formerly Stash) does not have the kind of built-in wiki like GitHub does. Atlassian has it's own separate wiki instance called Confluence (https://www.atlassian.com/software/confluence/) which can be integrated somehow with Bitbucket.
Bitbucket Pipelines helps me manage and automate a number of serverless deployments to AWS Lambda and this is how I do it. I'm building Node.js Lambda functions using node-lambda ...
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