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

[mudler]

Description

This pull request adds a new entry to the gallery/index.yaml file for the NVIDIA OpenMath-Nemotron-14B-Kaggle model. The update provides metadata, file details, and descriptions for this model.

Additions to the gallery:

• Added a new entry for the nvidia_openmath-nemotron-14b-kaggle model, including its name, icon, description, and relevant URLs. The description highlights its fine-tuning on the OpenMathReasoning dataset and its use in the AIMO-2 Kaggle competition.
• Included file details for the model (nvidia_OpenMath-Nemotron-14B-Kaggle-Q4_K_M.gguf), such as its sha256 hash and URI.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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