Build and style static get involved page

David added page to home controller and config routes. I'm not sure wy but the highlighted tab is How Gov Works.

https://www.pivotaltracker.com/story/show/44946241
update headers add dl and other changes in response to branch feedback

https://www.pivotaltracker.com/story/show/44946241
Pull request - https://github.com/alphagov/whitehall/pull/285
updating header copy and removing jump links

https://www.pivotaltracker.com/story/show/44946241
adding microcopy, updating content and design

Updated content and design inline with changes from Stephen.
Removed traces of jumps links and refectored header with new format jump link style intro text.

https://www.pivotaltracker.com/story/show/44946241 and
https://www.pivotaltracker.com/story/show/45154863
adding more actual content
updating content
adding content and updating in response to feedback
Add dynamic counts of consultations to get involved

There are two incomplete things here:

1. we don't get the count of the responses published in the past 12
months. That's a bit tricky to do because the 'publication date' of a
response is either the explicit published_on field or else the first
created date of one of the attachments. Not only does this make it
difficult to filter the responses by published date, but it also seems
slightly wrong logic (you might prepare the draft with the response
documents some days before actually publishing)

2. similarly the list of recent responses is slightly incorrect. It
returns the 3 most recently closed consultations that have responses,
rather than the 3 most recent responses.
updating content and responding to feedback
optimising images