Update README.md

Added an important notice

Author: lakruzz

README.md

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+> [!IMPORTANT]  
+> The maintenance of this particular repo is discontinued.<br/>
+> You should head over to [thetechcollective/dx-intro](https://github.com/thetechcollective/dx-intro).<br/>
+> _same same_ but maintained!
+
+
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 # DX (Developer Experience) intro
 **DX - Developer Experience. This tutorial introduces some of the features in the GitHub eco-system that will make your team go faster - in a very DevOpsy way.**