### Summary
Explicitly replaces all old docs pages with a link to the new docs. This
was required because 404 redirects didn't work for pages that previously
existed, though they worked non-existing paths that never existed.
To test:
> cd docs && make html
Change logs:
* Examples are reorganized to have its own page
* Removed two old examples, ie. "file-utils" & "sentiment analysis".
* Added two examples: "RAG with Unstructured, LangChain, and ChromaDB" &
"Multi-Files Processing with S3 Connector and API"
* Reorganized and added detailed API documentation: (i) usage, (ii)
SDKs, (iii) Azure Marketplace, (iv) AWS Marketplace, (v) parameters and
validation errors