minor: use case docs

[bracesproul]

to port:

• [x] CONCEPTS
• [x] LANGSMITH
• [x] MODIFY
• [x] PRODUCTION
• [x] RUN_LOCALLY
• [x] DEPLOYMENT

TODO: Update vercel frontend as root dir after merge (confirm builds & starts locally)

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
chat-langchain	❌ Failed (Inspect)			Mar 7, 2024 11:21pm