Add support link to the banner

[andergmartins]

Maybe the link could be a button? "Maybe later, I have a question", or "Maybe later, I have an issue".
Another option is to add a link and a more direct label: Contact support.

The intention is to make sure we make clear we are always glad to help in case they have any issues or questions, trying to avoid low score reviews just because of a bug.

The link has to be different for the Free and Pro versions, so we need to create a filter for customizing it.