adds rel canonical on main sections

app/views/budgets/index.html.erb

@@ -1,3 +1,7 @@
+<% content_for :canonical do %>
+  <%= render "shared/canonical", href: budgets_url %>
+<% end %>
+
 <div class="expanded budget no-margin-top padding">
   <div class="row">
     <div class="small-12 column">

app/views/debates/index.html.erb

@@ -4,6 +4,9 @@
              search_path: debates_path(page: 1),
              i18n_namespace: "debates.index.search_form" %>
 <% end %>
+<% content_for :canonical do %>
+  <%= render "shared/canonical", href: debates_url %>
+<% end %>
 
 <main>
   <h1 class="sr-only"><%= t("shared.outline.debates") %></h1>

app/views/layouts/application.html.erb

@@ -7,6 +7,7 @@
     <%= render "layouts/tracking_data" %>
     <%= render "layouts/meta_tags" %>
     <title><%= content_for?(:title) ? yield(:title) : setting['org_name'] %></title>
+    <%= content_for :canonical %>
     <%= stylesheet_link_tag    "application" %>
     <!--[if lt IE 9]>
       <%= stylesheet_link_tag "ie" %>

app/views/pages/more_info/index.html.erb

@@ -1,4 +1,7 @@
 <% provide :title do %><%= t("pages.titles.more_info", org_name: setting['org_name']) %><% end %>
+<% content_for :canonical do %>
+  <%= render "shared/canonical", href: more_info_url %>
+<% end %>
 
 <div class="jumbo light">
   <div class="row">

app/views/polls/index.html.erb

@@ -1,5 +1,8 @@
 <% provide :title do %><%= t("polls.index.title") %><% end %>
 <% content_for :wrapper_class, "light" %>
+<% content_for :canonical do %>
+  <%= render "shared/canonical", href: polls_url %>
+<% end %>
 
 <div class="expanded no-margin-top dark-heading">
   <div class="row">

app/views/proposals/index.html.erb

@@ -4,6 +4,9 @@
              search_path: proposals_path(page: 1),
              i18n_namespace: "proposals.index.search_form" %>
 <% end %>
+<% content_for :canonical do %>
+  <%= render "shared/canonical", href: proposals_url %>
+<% end %>
 
 <main>
   <h1 class="sr-only"><%= t("shared.outline.proposals") %></h1>

app/views/shared/_canonical.html.erb

@@ -0,0 +1 @@
+<link rel="canonical" href="<%= href %>">