Fix README link in data designer basics notebook
          #377
        
          
      
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Currently this links to https://github.com/NVIDIA/GenerativeAIExamples/blob/be9acc9b9286a8b4ba3ef6d56dcb7ff989d5681a/nemo/NeMo-Data-Designer/self-hosted-tutorials/README.md (which doesn't exist). This PR updates the link to point to https://github.com/NVIDIA/GenerativeAIExamples/blob/be9acc9b9286a8b4ba3ef6d56dcb7ff989d5681a/nemo/NeMo-Data-Designer/README.md where the install instructions live