Still too much logic in the views

[neilbmclaughlin]

Depending on state, the values of the header, contextual text and form class tag change but the presence of the elements themselves in app/views/includes/search-form.nunjucks do not.

Much of the conditional code, which at present is spread between the render and preRender middleware and the view template, could be consolidated into the testable messages lib with it's purpose to populate an object of heading, text and class.