New Required Backlink attribute

Every Backlink used in Advice has a series of attributes on the web components generated by the Taffrail API when using the HTML Advice Content Type.

Today, we're announcing a new Backlink attribute named data-backlink-required. This attribute indicates to API consumers that the user interface should require any attributed Backlink. The value of this attribute will be false when displaying the Backlink as an optional chip.