Remove government-navigation

This element is not required in the new layout as the header navigation is now embedded in the public layout.

app/helpers/application_helper.rb

@@ -17,25 +17,7 @@ def wrapper_class
     "direction-#{page_text_direction}" if page_text_direction
   end
 
-  def active_proposition
-    # Which of the government sections is the page part of?
-    # Derive this from the request path, eg: /government/consultations => consultations
-    active = request.original_fullpath.split("/")[2]
-    active_proposition_mapping.fetch(active, active)
-  end
-
   def current_path_without_query_string
     request.original_fullpath.split("?", 2).first
   end
-
-private
-
-  def active_proposition_mapping
-    # Some paths don't map directly to the position nav
-    # eg /government/news sits under 'announcements'
-    {
-      "news" => "announcements",
-      "fatalities" => "announcements",
-    }
-  end
 end