index.html textual improvements

[Jonasvsl]

Intro page

https://docs.staging.3di.live/

This part has to be extended, 3Di distinguishes itself on more than that:

• API
• Use of GIS model building
• Workflow support
• management of models and schematisations
• etc
  It would be best to make headlines or bullets to keep it readable

3Di distinguishes itself from other hydrodynamic software products because of the option to model interactively and visually. For example, it is possible to add or change external forcings (such as rain and wind), breaches and pump capacities during a simulation. Another very strong aspect of 3Di is the use of the subgrid technique. This technique includes high resolution information in coarse resolution computations, without compromising on calculation speed or detail. Furthermore, it enables integrated modelling where overland, channel, sewer, and groundwater flows can be taken included in one calculation.