Migrate netflix and titanic examples to Kandy

[koperagen]

[zaleslaw]

@koperagen could you please clarify the issue? Add links to the examples, motivation (why to do it), and what places should be changed (or added from scratch)

[koperagen]

Sure. These 2 notebooks use lets-plot for building plots, but now we also have Kandy. I think it will be nice to replace usages of lets-plot API with kandy api because it's intended to provide nicer Kotlin DSL and to be a default choice for visualization in the notebooks
https://github.com/Kotlin/dataframe/tree/master/examples/notebooks/titanic
https://github.com/Kotlin/dataframe/tree/master/examples/notebooks/netflix

[zaleslaw]

@koperagen please, have a look, seems, like it's not actual anymore and I could close it

[Jolanrensen]

Actually, it was fixed in #548