allenai/Flex-creative-2x7B-1T · Improve model card: Add pipeline tag, project page, and update paper/citation links

Hi!

This PR improves the model card for FlexOlmo by:

Adding the pipeline_tag: text-generation to the metadata, which enhances discoverability on the Hub and enables the Inference Widget.
Adding the project_page: https://allenai.org/blog/flexolmo to the metadata for better access to the project's official blog.
Updating the paper link in the content to point to the Hugging Face Papers page: FlexOlmo: Open Language Models for Flexible Data Use.
Correcting the eprint and url fields in the BibTeX citation to reflect the accurate arXiv identifier and its direct link.

Thanks for sharing this model with the community!

Best,
Niels
Community Science team