Leveraging --port flag to change browsersync port

[nicholasio]

Description of the Change

Fixes #89 by allowing passing a --port flag to browser sync 10up-toolkit start|watch --port=3002

Alternate Designs

Benefits

Possible Drawbacks

Verification Process

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

Changelog Entry

Fixed: Allows passing a --port flag to browser-sync 10up-toolkit start|watch --port=3002

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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