chore(model gallery): add steiner-32b-preview

[mudler]

Description

This pull request includes an addition to the gallery/index.yaml file, introducing a new model named "steiner-32b-preview" with detailed descriptions and associated metadata.

Additions to gallery/index.yaml:

• Introduced a new model entry named "steiner-32b-preview" with URLs for downloading the model files from Hugging Face.
• Provided a comprehensive description of the "steiner-32b-preview" model, explaining its purpose, inspiration, and the reasoning behind open-sourcing it.
• Added metadata for the model, including parameters and file details, such as filename, sha256 checksum, and URI for the model file.

Notes for Reviewers

Signed commits

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