The static previews don't support the social badges. Adding that lets us remove support for `exampleUrl`. Close#2479.
This includes `style` and `namedLogo` in the service-definition export and updates the frontend to use it. To accomplish this, it passes `namedLogo` through `coalesceBadge`. After logo resolution is moved to `makeBadge` this duplication can be removed, as `logo` will no longer be needed in the result of `coalesceBadge`.
5b122ddd73