Refine bnext work that needs to happen

[GeorgianaElena]

Context

A meeting has happened between bnext community and 2i2c. The meeting notes are at https://2i2c.slack.com/archives/C01GLCC1VCN/p1762364861419019.

What we need to do

Based on that conversation, we need to refine #7078 so that we can commit the work that needs to happen before their first event on the hub.

For context, this is the current state of the user image https://github.com/2i2c-org/bnext-nucleus-image (it hasn't yet been curated).

Definition of Done

• Finish b.next hub set up ahead of their event #7078 is refined

[GeorgianaElena]

@agoose77, I've tentatively assigned you to this because you were at the meeting. Hope that's ok