Add AI agent setup with LangChain

[louis-md]

Add a tutorial to set up a LangChain agent and configure basic requests with Safe.

[github-actions]

Branch preview

✅ Deployed successfully in branch deployment:

https://ai_agent_tutorial--docs.review.5afe.dev

[github-actions]

Overall readability score: 35.83 (🔴 -0.02)

File	Readability
ai-agent-setup.mdx	69.33 (-)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
ai-agent-setup.mdx	69.33	62.48	10.18	9.7	9.1	7.25
	-	-	-	-	-	-

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	35.83	31.34	13.22	16.57	15.05	8.74
	🔴 -0.02	🟢 +0.05	🔴 -0.01	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[valle-xyz]

Some first change requests. I will continue the review tomorrow. Feel free to wait for my final review.

[valle-xyz]

Remove the intro. I think this tutorial does not need to link to the hackathon or the quickstart guides. And we expect 20-30% of the onchain activitity to come from agents for 2025. So not sure about the majority.