Intro page issues

[fatima-gov]

@bernars-usa @dmethvin-gov let's talk about this as a follow up to #154

Document that intro page and confirmation page are not included in the form itself. If embedding the form in an existing application, these aren’t available.

Cc: @usds/forms-system

[dmethvin-gov]

Also the Intro bug mentioned in the first bullet in #149 . There may be other things on that list that need docs or bug tickets.

[dmethvin-gov]

The intro bug in the starter app was fixed by usds/us-forms-system-starter-app#15 but there is still the original question of whether this should be defined as a standard pages page rather than a React component. That fix to the starter app should actually work regardless, since the current code pushes the special-case intro page onto the routes as /introduction anyway.

[bernars-usa]

Both the intro and review pages are properly documented as described. @dmethvin-gov, do you need to move the information in #160 (comment) into a new issue for your tracking?

[dmethvin-gov]

@bernars-usa It's covered by #150 so it looks like this ticket is good to close.