Allow to delete journey segments

Is your feature request related to a problem? Please describe.

Once a segment has been added to a journey, it is not possible to alter or delete it anymore. For a start, it should be possible to delete segments from the beginning and end of a journey

Describe the solution you'd like

Swiping the segment to the side to delete it. Advantage: Takes up no space. Quick and easy once you have it figured. Disadvantage: Is not obvious to users.

Describe alternatives you've considered

A button: where to place it? In the top bar and then choose whether you want to delete the first or last segment? In the expanded segment?