[UNIT] Unit 2.1 smolagents framework final content addition - release 25/2/25

[sergiopaniego]

Final content additions to the Unit 2.1 smolagents framework.

It includes:

• Telemetry example
• Vision+Browser agent example
• Mention best open model
• Include multiagent notebook with the rest of the content
• Upload notebooks to HF Org (once they're approved) and update the .mdx accordingly.
• Upload image and video to HF Org (once they're approved) and update the .mdx accordingly.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[sergiopaniego]

Ready for review @burtenshaw!

I've included all the discussed content. Once approved, I'll upload the image, video, and notebooks to the HF Org to avoid duplicating work. --> Already uploaded to https://huggingface.co/datasets/agents-course/course-images and pending approval.

I also think it would be interesting to extend the notebooks (.ipynb) to incorporate the narrative explained throughout the unit, but I wanted to avoid redundancy for now. I can update them once everything is approved. 😄 --> Already done and uploaded as a PR to the HF Org here