chore(model gallery): add nano_imp_1b-q8_0

[mudler]

Description

This pull request updates the gallery/index.yaml file to add a new AI model, Nano_Imp_1B, which is described as the world's first fully coherent 1B-parameter roleplay model. The addition includes metadata, descriptions, and file details for the model.

Addition of the Nano_Imp_1B model:

• Metadata: Added a new entry for Nano_Imp_1B with its name, icon URL, and associated URLs.
• Description: Included a detailed narrative explaining the significance of the model, its development, and its accessibility for users with mid-tier devices.
• File details: Added file information, including the filename, SHA256 checksum, and URI for downloading the model.

Notes for Reviewers

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