[UNIT] Unit 2.1 smolagents adding final notebooks and media - release 25/2/25

[sergiopaniego]

In this PR:

• Removed media Unit 2.1 content from this repo (video and output image), linked from HF Org.
• Updated notebook links.
• Fixed some typos.
• Updated multiagent section addition notebook outputs and updated original notebook since it was not directly reproducible using Colab.

@burtenshaw

[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.

[burtenshaw]

Thanks.

[burtenshaw]

Thanks.