Create blogpost on optimising RAG Pipelines with Kubeflow Katib

[varshaprasad96]

Add a post that explores how Kubeflow Katib can be leveraged to optimize RAG pipelines by fine-tuning key hyperparameters. This can help ML engineers, data scientists, and researchers understand how to integrate Katib in RAG-based applications.

[varshaprasad96]

cc: @franciscojavierarceo