Better layout for bigger devices (tablets)

[bennyboer]

The app doesn't look good for bigger devices. We should layout screens differently.

First step is to check how we want to change the existing layouts in order to support such devices.

[Gleydar]

We could also think about switching all our Streams to Bloc's https://bloclibrary.dev/#/gettingstarted, this would increase the size of the project dramatically, however