Align overview image with task-based organization

[kaelynj]

URL to the relevant documentation

https://quantum.cloud.ibm.com/docs/en/guides

Please describe the UI problem or feature request.

Once our changes to the TOC land #4251, we should update the image we have in the overview page to match the task-based organization we're changing to. We'll likely need a few convos with the design folks to iterate on the changes.