Display text extract on individual page

[Jen-Harris]

We need to show the text extract prior to showing the question to allow the user a chance to understand the text without the distraction of a question.

User story: "Before answering a question, I will have a chance to read the question text extract in advance"

To complete this issue we need to:

• large font version of the extract
• large font version of the question
• distinctive 'question' page format
• Be able to navigate to the question, back a screen or to the home page

[rachaelcodes]

duplicate of #20