Documentation and README lack information about Kotlin Notebook

[koperagen]

We need to point users to Kotlin Notebook installation in README and provide instruction in the documentation. We can take it from https://kotlin.github.io/kandy/kandy-in-kotlin-notebook.html
Places with outdated info
https://github.com/Kotlin/dataframe?tab=readme-ov-file#getting-started-in-jupyter-notebook--kotlin-notebook
https://kotlin.github.io/dataframe/gettingstartedjupyternotebook.html

One page should cover features of Kotlin Notebook + dataframe integration, i.e. tables
https://blog.jetbrains.com/kotlin/2024/05/streamline-data-analysis-with-kotlin-dataframe-tables-in-notebooks/

[koperagen]

Notebooks have ktor-client, i believe we need an integration and then to document it too

[koperagen]

We can also refer here https://kotlinlang.org/docs/kotlin-notebook-create.html

[Jolanrensen]

Notebooks have ktor-client, i believe we need an integration and then to document it too

Actually, I think it might be a good idea to promote accessing APIs with ktor in normal examples as well. It can do certain HTTP requests with authentication etc. not possible with DataFrame itself.