add link to holoviz tutorial

doc/tutorials/index.md

@@ -4,6 +4,8 @@ Here, we will point you to the getting started guide as well as other tutorials
 
 For example, here's the first [Getting Started](getting_started/index.ipynb)
 
+You can also view the [holoviz tutorial](https://holoviz.org/tutorial/index.html) where we show you all the ways you can analyse your data using all the holoviz suite of tools together
+
 ```{toctree}
 :titlesonly:
 :hidden: