chore(model gallery): add trappu_magnum-picaro-0.7-v2-12b

[mudler]

Description

This pull request includes an update to the gallery/index.yaml file, adding a new model entry. The new entry describes a merged model aimed at improving storytelling and creative writing capabilities.

Addition of new model entry:

• Added a new model named "trappu_magnum-picaro-0.7-v2-12b" with a detailed description explaining its purpose and the rationale behind its creation. The model is a merge between "Trappu/Nemo-Picaro-12B" and "anthracite-org/magnum-v2-12b." The entry includes URLs to the model on Hugging Face, a description of its strengths and weaknesses, and the goal of the merge.
• Included specific parameters and file details for the new model, such as the model file name, SHA256 hash, and URI for downloading the model.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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