Add sdg help page

In this page we will render a list of clickable Goals icons that will show their
targets and related local targets

Co-authored-by: Senen <senenrodero@gmail.com>

app/components/sdg/goals/help_page_component.rb

@@ -0,0 +1,17 @@
+class SDG::Goals::HelpPageComponent < ApplicationComponent
+  attr_reader :goals
+
+  def initialize(goals)
+    @goals = goals
+  end
+
+  def render?
+    feature?("sdg")
+  end
+
+  private
+
+    def is_active?(goal)
+      "is-active" if goal.code == 1
+    end
+end