chore: Update banner image in README.md (#385)

Author: julian-risch

README.md

@@ -1,7 +1,7 @@
 # Haystack Tutorials
 
 <div align="center">
-  <a href="https://haystack.deepset.ai/"><img src="https://github.com/deepset-ai/haystack/blob/main/docs/img/banner_20.png" alt="Green logo of a stylized white 'H' with the text 'Haystack, by deepset. Haystack 2.0 is live 🎉' 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/docs/img/banner.png" alt="Green logo of a stylized white 'H' with the text 'Haystack, by deepset. Haystack 2.0 is live 🎉' 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.
@@ -59,4 +59,4 @@ Haystack 2.0
 | [Answering Complex Questions with Agents](./tutorials/23_Answering_Multihop_Questions_with_Agents.ipynb)  | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepset-ai/haystack-tutorials/blob/main/tutorials/23_Answering_Multihop_Questions_with_Agents.ipynb)                |                                                                                                                  |                                                                                                                                                                                                                          |
 | [Building a Conversational Chat App](./tutorials/24_Building_Chat_App.ipynb)                              | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepset-ai/haystack-tutorials/blob/main/tutorials/24_Building_Chat_App.ipynb)                                       |                                                                                                                  |                                                                                                                                                                                                                          |
 | [Customizing Agent to Chat with Your Documents](./tutorials/25_Customizing_Agent.ipynb)                   | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepset-ai/haystack-tutorials/blob/main/tutorials/25_Customizing_Agent.ipynb)                                       |                                                                                                                  |                                                                                                                                                                                                                          |
-| [Creating a Hybrid Retrieval Pipeline](./tutorials/26_Hybrid_Retrieval.ipynb)                             | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepset-ai/haystack-tutorials/blob/main/tutorials/26_Hybrid_Retrieval.ipynb)                                        |                                                                                                                  |                                                                                                                                                                                                                          |
+| [Creating a Hybrid Retrieval Pipeline](./tutorials/26_Hybrid_Retrieval.ipynb)                             | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepset-ai/haystack-tutorials/blob/main/tutorials/26_Hybrid_Retrieval.ipynb)                                        |                                                                                                                  |                                                                                                                                                                                                                          |