fix: Replace Rectangle-only image with an image that can work with sq…

[jswope00]

…uare cropping

The original thumbnail did not work well with new square crop on Quince and beyond versions of Open edX® LMS.

[openedx-webhooks]

Thanks for the pull request, @jswope00! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

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[kdmccormick]

Hey @jswope00 , we're ready to move development over to the official openedx-demo-course repository. I'm closing your PR here, but I've copied the changes into this openedx-demo-course PR.

[openedx-webhooks]

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