CTA

Tiny PR to add a primary cta to the car cost calculator on the car campaign page. Do we have a rails friendly url for the car cost tool?
Firstly, this can't go here `match '*path', via: :all, to: NOT_IMPLEMENTED` is our catch-all route and should be the final route definition.

Secondly, we already have a scope for locales with constraints, we shouldn't duplicate that concern again by matching `:locale`. Instead we should match within the scope so that we're only introducing what we're concerned about - tools:

```rb
scope '/:locale', locale: /en|cy/ do
  # ...
  match '/tools/:id', to: NOT_IMPLEMENTED, via: 'get', as: 'tool'
end

```