Clean up

This removed current WIP chat and RAG chat chains (they are still available on RAG branch) and their etl script.

The current server.py exposes just a sample endpoint with optional authentication via an API_KEY if set in the coresponding .env.* file. See README for details.

.vscode/settings.json

@@ -8,6 +8,7 @@
     "fastapi",
     "haveged",
     "LANGCHAIN",
+    "langserve",
     "llminfrastructure",
     "llms",
     "OPENAI",
@@ -16,6 +17,7 @@
     "starlette",
     "Supabase",
     "TRAEFIK",
+    "uvicorn",
     "vectordb",
     "vectorstore",
     "vectorstores",