feat: scale the scheme details page by 2/3 to match the locations list page

app/views/schemes/show.html.erb

@@ -10,11 +10,13 @@
 
 <%= render partial: "organisations/headings", locals: { main: @scheme.service_name, sub: nil } %>
 
-<%= render SubNavigationComponent.new(items: scheme_items(request.path, @scheme.id, "Locations")) %>
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-two-thirds-from-desktop"> 
+    <%= render SubNavigationComponent.new(items: scheme_items(request.path, @scheme.id, "Locations")) %>
 
-<h2 class="govuk-visually-hidden">Scheme</h2>
+    <h2 class="govuk-visually-hidden">Scheme</h2>
 
-<%= govuk_summary_list do |summary_list| %>
+    <%= govuk_summary_list do |summary_list| %>
       <% display_scheme_attributes(@scheme).each do |attr| %>
         <% next if current_user.data_coordinator? && attr[:name] == ("Housing stock owned by") %>
         <%= summary_list.row do |row| %>
@@ -23,7 +25,10 @@
           <% row.action(text: "Change", href: scheme_edit_name_path(scheme_id: @scheme.id)) if attr[:edit] %>
         <% end %>
       <% end %>
-<% end %>
+    <% end %>
+
+  </div>
+</div>
 
 <% if FeatureToggle.scheme_toggle_enabled? %>
   <% if @scheme.active? || @scheme.reactivating_soon? %>