Implement an article with hard coded content

Setting up an article pages that is styled utilising the govuk frontend toolkit and govuk elements. 
Implementing my preferred BEM and folder structure to make the code base maintainable.
I'm temporarily using the styles from gov_uk static to style the article content.

@jiannis @gjvis @andrewgarner 
In cases like this you want to avoid surprise newlines. Its might be better to use:
```erb
<% content_for(:page_title, 'Check the value of your pension pot - The Pension Guidance Service') %>
```