chore: replace edx-brand direct installation

[huniafatima-99]

Description

This PR replaces brand-edx.org with openedx theme and adds it to the package file indirectly via aliasing.

Supporting information

Issue Link: edx/edx-arch-experiments#943

Link to the PR which is associated with the same issue
edx/configuration#179

[openedx-webhooks]

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[feanil]

Looks like this landed via #37244