Remove the "Create a Free board" button option

Allow board owner to disable the “Create a Free board” button. I could understand if this was a only possible on a paid account, but it is not possible at all. We have a client that wants to use the enterprise version but they don’t want to require users to create an account or sign-in. In fact, they want the comments to be anonymous and make it easy to submit feedback. This means that there is no way to hide this prominent yellow button and it makes the paid product look clunky, sketchy, and cheap.