docs: Remove unmaintained repository warning

Removed maintenance notice from README.

Author: Prajwal-Microsoft

README.md

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-     <b>⚠️ This repository is no longer maintained ⚠️</b>
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 # Document knowledge mining solution accelerator
 
 Ingest, extract, and classify content from a high volume of assets to gain deeper insights and generate relevant suggestions for quick and easy reasoning. This enables the ability to conduct chat-based insight discovery, analysis, and receive suggested prompt guidance to further explore your data.