Update AMB NIP

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Flattening of AMB as discussed in https://pad.lobid.org/qVXlt9taT8KiSkhMs5q_yA?view#2025-10-15-Community-Call-AMB

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Reviewers: @JannikStreek @joerglohrer

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Accidentally I already pushed to main... :D

But you might wanna have a look at the current version of:

https://github.com/edufeed-org/nips/blob/edufeed-amb/edufeed.md

I willl have to have a second look at the conversion code. I let that generate and didn't test yet.

cc @joerglohrer @JannikStreek