Replace or remove the play button to start a mission

[thoughtsky]

Might be confusing. Think about a replacement or removal.

Currently the 'Missions' page in the Figma file (in the volunteer exp in 0. MVP v.0 (for dev delivery)) has a small 'play' icon next to 'start'. Some of us were concerned about what a play button might suggest to a user. e.g. is there a timer? is there monitoring? Can I pause my mission? etc.

We may need to either change the icon, remove or build out further experience that 'makes sense' with a play button.