moca-embed/tevatron_colpali · Improve dataset card: Add task category, license, and tags

This PR improves the dataset card by adding crucial metadata to enhance its discoverability and provide more context:

Adds task_categories: visual-document-retrieval to accurately classify the dataset's primary task.
Specifies license: cc-by-nc-4.0.
Includes library_name: transformers, as the dataset is intended for use with models often built and used with the Hugging Face Transformers library.
Adds relevant tags: multimodal, embeddings, pretraining, document-retrieval, and interleaved-data to better describe the dataset's nature and application.

The existing dataset_info and configs metadata have been preserved. No changes were made to the existing paper, code, or project links in the markdown content.