Add a link from the organisation page to its services and information page

https://www.pivotaltracker.com/story/show/75201000

This adds a link to the services and information page from the list of "services and guidance" on the organisation home page.

Right now, we're going to whitelist the orgs on which this link will be displayed. (which is to be finalised really soon).

Please don't merge just yet, but would like a review of the code.