[Improvement] Disable button to continue to relayer demo if the safe has no funds

[JagoFigueroa]

Description

It would be nice to not allow users to continue with the relayer demo flow when the transaction is sure to fail due to a lack of funds on the Safe.

Steps to reproduce

Open the demo app on a chain where a safe account that has not been created yet and has no funds.

Obtained result

Possible to continue with the flow when it is certain to fail.

Expected result

Unable to continue with the flow and send a relayed transaction.

To keep things simple I would disable the 'Go to relayer demo' only when funding is 0.00

[JagoFigueroa]

Closing this ticket as it does not make too much sense to tackle it on the redesigned interface (user is free to move between kits freely now).