hub: add migrate autobuilds

[craig-osterhout]

Description

Added topic to help users migrate from autobuilds to github actions or bitbucket pipelines.

https://deploy-preview-23725--docsdocker.netlify.app/docker-hub/repos/manage/builds/migrate/

Related issues or tickets

ENGDOCS-3110

Reviews

• [ ] Technical review
• [ ] Editorial review
• [ ] Product review

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