chore: update demo movie in README.md

[KJmirumee]

Changed movie file for better representation of the current store

Resolves:
NA

I want to merge this change because I was asked for update by marketing team.

Pull Request Checklist

NA

• Test the changes locally to ensure they work as expected.
• Document the testing process and results in the pull request description. (Screen recording, screenshot etc)
• Include new tests for any new functionality or significant changes.
• Ensure that tests cover edge cases and potential failure points.
• Document the impact of the changes on the system, including potential risks and benefits.
• Provide a rollback plan in case the changes introduce critical issues.
• Update documentation to reflect any changes in functionality.

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Name	Status	Preview	Comments	Updated (UTC)
nimara-ecommerce	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 21, 2024 6:40am