Update Powered By Images to match new brand colors

[e0d]

Firm Name

Axim

Urgency

Low (2 weeks)

Problem/Request

This is to start the discussion about updating the Powered By Open edX images that we host.

The new versions are here: https://drive.google.com/drive/folders/1HhZccSSBBMp9KCv2JL5CW90khMXXiADl

We need to think through how we want this update work mechanically. Opening this item to start the conversation.

Reasoning

Because we want to update the colors and logo universally over time.

[github-actions]

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