docs: add bitbucket to ci-setup guide

[grantwforsythe]

Description

Add a section in the CI Setup docs to utilize commitlint within a BitBucket pipeline.

Motivation and Context

I recently implement this at work think it would be useful for other's that are required to work with BitBucket!

Usage examples

// commitlint.config.js
module.exports = {};

echo "your commit message here" | commitlint # fails/passes

How Has This Been Tested?

I implemented this at work and I also previewed the docs locally:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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[escapedcat]

Thanks!

[...]required to work with BitBucket

:D