Add view for `Edit Power-Up Settings`

Add view for Edit Power-Up Settings. Follow up from !5 (merged)

mentioned in merge request !5 (merged)

mentioned in merge request !7 (merged)

In an effort to keep things simple, I think we should just have this view display the same contents as the configuration page and fill out the fields (and mask the token field)

mentioned in merge request !15 (merged)

closed via merge request !15 (merged)

changed milestone to %1.0