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

[sergiopaniego]

Final content additions to the Unit 2.1 smolagents framework.

It should include:

• Telemetry example
• Vision+Browser agent example
• Mention best open model
• Convert .md -> .mdx

[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.

[aymeric-roucher]

I'm working at the moment on making a revised version of the multiagent notebook that uses Qwen Cder 32B and DeepSeek-R1!

[burtenshaw]

Just highlighting that units/en/unit2/smolagents/multi_agent_systems.md also needs updating. Feel free to do it in either PR @sergiopaniego .

Also mentioned here:
#195 (comment)
#199 (comment)