Nb antigen tutorial

[mgiulini]

tutorial about nanobody-antigen modelling using a combination of AI-derived nanobodies and HADDOCK.

The considered case fails with both AlphaFold2 and AlphaFold3.

Missing pieces:

• link to HADDOCK3 repo examples (will work as soon as added nanobody example data haddock3#1207 gets merged)
• link to biorxiv preprint (now empty)
• it would be nice to reference the HADDOCK3 manual when discussing technicalities

Closes #692

[AnnaKravchenko]

Question about BONUS1: do you have similar "native score" in [alascan] compared to the score given by [emscoring]?
Asking because I’ve got delta of 10 - quite a lot - using same workflow (on the different input PDB), so curious if it’s the same in this case