LangChain section cleanup#669

torresmateo wants to merge 4 commits intomainArcadeAI/docs:mainfrom

mateo/dev-279-remove-obsolete-langchain-docs-now-covered-by-new-tutorialArcadeAI/docs:mateo/dev-279-remove-obsolete-langchain-docs-now-covered-by-new-tutorialCopy head branch name to clipboard