Update experiments_preview with image and link to blogpost

[CFLJacquet]

What does this PR do? What is the motivation?

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Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/CFLJacquet/llm-experiments-preview-update/llm_observability/experiments_preview

[rtrieu]

Thanks for your PR! I left a few suggestions on expanding the image caption and how to link out to external resources to the doc.

[rtrieu]

sorry caught a few more things! btw, have you enabled git commit signing? each commit needs to be signed now. if not, here’s how to set up commit signing.