simplay / simplay-web / simplay-jupyter: automatic size of grid

[moschi]

Currently, fixed dimensions need to be provided for the grid. This might cause issues on differently sized displays. It might be useful, to have an "auto-mode" for sizing the grid.

DoD:

• idea is elaborated and discussed
• a proposal exists of how to implement the feature, or it’s decided to not do it
• follow up tasks created