Add cards to SDG homepage

app/components/sdg/goals/index_component.html.erb

@@ -1,3 +1,13 @@
 <div class="sdg-goals-index">
   <%= link_list(*goal_links, class: "sdg-goal-list") %>
+
+  <% phases.each do |phase| %>
+    <section class="sdg-phase" id="sdg_phase_<%= phase.kind %>">
+      <header>
+        <h2 class="title"><%= phase.title %></h2>
+      </header>
+
+      <%= render "shared/cards", cards: phase.cards %>
+    </section>
+  <% end %>
 </div>

app/components/sdg/goals/index_component.rb

@@ -1,9 +1,10 @@
 class SDG::Goals::IndexComponent < ApplicationComponent
-  attr_reader :goals
+  attr_reader :goals, :phases
   delegate :link_list, to: :helpers
 
-  def initialize(goals)
+  def initialize(goals, phases)
     @goals = goals
+    @phases = phases
   end
 
   private