models(gallery): add valor-7b-v0.1

[mudler]

Description

This pull request includes an update to the gallery/index.yaml file, adding a new model entry for "valor-7b-v0.1". The most important changes include adding the model's metadata, description, and file details.

New model addition:

• Added a new model entry "valor-7b-v0.1" with metadata including icon URL, source URL, and name.
• Included a description for the new model, highlighting its purpose and dataset used for finetuning.
• Added file details for the new model, including filename, sha256 checksum, and URI.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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