update banner link

Author: anakin87

README.md

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 # Haystack Tutorials
 
 <div align="center">
-  <a href="https://haystack.deepset.ai/"><img src="https://github.com/deepset-ai/haystack/blob/main/docs/img/banner.png" alt="Green logo of a stylized white 'H' with the text 'Haystack, by deepset.' Abstract green and yellow diagrams in the background."></a>
+  <a href="https://haystack.deepset.ai/"><img src="https://github.com/deepset-ai/haystack/blob/main/images/banner.png" alt="Green logo of a stylized white 'H' with the text 'Haystack, by deepset.' Abstract green and yellow diagrams in the background."></a>
 </div>
 
 [**Haystack**](https://github.com/deepset-ai/haystack) is an open source framework by [**deepset**](https://deepset.ai) for building production-ready **LLM applications**, **retrieval-augmented generative pipelines** and **state-of-the-art search systems** that work intelligently over large document collections. It lets you quickly try out the latest models in natural language processing (NLP) while being flexible and easy to use.