[Improvement] Allow performing more operations from the interface

[JagoFigueroa]

I think it could be neat to allow more operations after the safe is created from the demo to add some value / usability to the created safe.

We could allow to perform some operations like:

• Send funds
• Add / Remove owners
• Change threshold

So that the created safe can be easily accessed from the web interface with a second owner with a EOA that it is supported by the interface.

It might be worth it to notify the users on the "Thanks!" screen that the safe can re-accessed from the demo ui to perform more operations for the created safe as well.