Blame for .env.example

OPENAI_API_KEY=sk-...
CHAT_MODEL=gpt-4o-mini
EMBEDDING_MODEL=text-embedding-3-small

NEO4J_URI=neo4j+s://xxxxxxxx.databases.neo4j.io
NEO4J_USERNAME=neo4j
NEO4J_PASSWORD=...
NEO4J_DATABASE=neo4j