Remove Composer

[unscripted]

Changes proposed in this pull request

This PR removes Composer from the theme.

Closes https://app.asana.com/0/1206339640467531/1206685929995910

Pre-submit checklist

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• [x] I have detailed how to test the changes in the Pull Request.
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• [x] I have performed a self-review of my code to ensure it is DRY and follows the team's coding standards.
• [ ] I have commented my code, particularly in hard-to-understand areas.
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• [x] I have verified that any dependent changes have been merged and published in downstream commits.
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Testing

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Code review

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Merging

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