Show the connection between tiltPlot and tiltIndicator

[maurolepore]

I suggest showing this example somewhere in the pakcage website -- maybe in "Get started" or a dedicated article.

I think this is important to show users the realtionship between different pieces of the tilt ecosystem, and will serve as an integration test. That is, if titlIndicator changes in an incompatible way, then this article should break -- warning you of the upstream change.