Ask about a document's origin

https://www.agileplannerapp.com/boards/173808/cards/5431

Implement prototype from [prototype-first-published](prototype-first-published): add compulsory radio choice with "this document is new" vs "previously published on another website", and if the latter then show a compulsory first_published date selector.

Rather than using a bold class could you not just use a `strong` tag. If you want some text to appear bold why wouldn't you want assistive technology to also know it is bold?