Update Logo and Branding

[gemanor]

Changes proposed

Updating OPAL Logo per the new branding

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• I sign off on contributing this submission to open-source
• [x ] My code follows the code style of this project.
• My change requires changes to the documentation.
• [ x] I have updated the documentation accordingly.
• [ x] All new and existing tests passed.
• [ x] This PR does not contain plagiarized content.
• [ x] The title of my pull request is a short description of the requested changes.

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[orweis]

Beautiful