Content of the info boxes

[FredericHirschmueller]

In the scenario overview, a description needs to explain how the start date of the scenario is linked to the timeseries, that are added later in the energy system design. Does the start date of the scenario need to be the same value as the start date of the timeseries? If not, what is the funstionality of the start date of the scenario?

[FredericHirschmueller]

Add descriptions for the constraints.

[Bachibouzouk]

Closed by #231