chore(model gallery): add thedrummer_rivermind-12b-v1

[mudler]

Description

This pull request adds a new entry for the thedrummer_rivermind-12b-v1 model to the gallery/index.yaml file. The entry includes metadata, URLs, a detailed description, and file information for the model.

Addition of a new model entry:

• Model metadata: Added a new entry for the thedrummer_rivermind-12b-v1 model, including its name, icon, and description. The description highlights the model's features, such as emotional analysis, cloud integration, and data security, with a marketing-style tone.
• URLs: Provided two URLs to access the model on Hugging Face, one under the TheDrummer namespace and another under the bartowski namespace.
• Overrides and file details: Added overrides for model parameters and included file information, such as the filename, SHA-256 checksum, and URI for the model file.

Notes for Reviewers

Signed commits

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