Simplify the mobile interface

On mobile, we want to keep buttons on screen at their lowest.

The measure distance button has an usage too rare to be featured on the homescreen. The weather icon could be triggered by hand to avoir useless queries. The icons should be worked to be more beautiful and understandable at a glance.

The icons are too small on mobile, especially high DPI dezoomed devices. The payment button is now useless until we work on the payment method.

An about button can't be found easily #840

Apple has done a great job simplifying the interface.

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