Create tutorial for modelling dynamic network capacity contracts

[Flix6x]

Since #985 it is possible to set up dynamic site capacities for the storage scheduler to be taking into account. This would be worth expanding our collection of example tutorials.

For example, with a site consumption capacity that is reduced in the evening (e.g. for public charging), and/or a site production capacity that is reduced in the afternoon (e.g. for solar parks). This could be a simple time-of-use sensor.

It's also possible to set up more dynamic site capacities whose sensor values are set by (or collected from) the distribution system operator, or a balance responsible party, but that's probably beyond the scope of a simple tutorial.

[nhoening]

Good idea. We can also add this to the tutorial which introduces an example with grid constraints.

I believe the number of tutorials should not become too high.

Btw, that tutorial should show the grid constraint in the plots, even more important when it is dynamic.