chore(model gallery): add nvidia_openmath-nemotron-14b

[mudler]

Description

This pull request adds a new entry for the "nvidia_openmath-nemotron-14b" model to the gallery/index.yaml file. The entry provides metadata, including a description, URLs, and file details for the model.

Addition of new model metadata:

• Added a new entry for the "nvidia_openmath-nemotron-14b" model, including its name, icon, description, and associated URLs. The description highlights the model's fine-tuning on the OpenMathReasoning dataset and its state-of-the-art performance on mathematical benchmarks.
• Included file details for the "nvidia_openmath-nemotron-14b" model, specifying the filename, SHA256 hash, and URI for downloading the model.

Notes for Reviewers

Signed commits

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