models(gallery): add mn-backyardai-party-12b-v1-iq-arm-imatrix

[mudler]

This pull request adds a new model entry to the gallery/index.yaml file, including detailed metadata and descriptions.

Additions to gallery/index.yaml:

• Added a new model entry for "mn-backyardai-party-12b-v1-iq-arm-imatrix" with metadata such as URL, name, icon, and description.
• Included multiple URLs for the model, providing different sources for access.
• Added a detailed description highlighting the model's training dataset and recommended usage.
• Specified overrides and file parameters for the new model.

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