create validator flow improvements

[sponnet]

• [ ] remove debug output in create pool (top box)
• [ ] select operator: filter out permissioned operators
• [ ] select operator: filter out operators that don't accept any more validators
• [ ] format SSV fee in readable format (now it's just a huge number)
• [ ] call to action at end of flow should be a button or link to "dashboard" (now it points to another page afaik)