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>

spec/system/sdg/goals_spec.rb

@@ -140,4 +140,34 @@ describe "SDG Goals", :js do
       end
     end
   end
+
+  describe "Help" do
+    scenario "shows all SDGs targets" do
+      create(:sdg_local_target, code: "15.1.1", title: "SDG local target sample text")
+      visit sdg_help_path
+
+      expect(page).to have_content "You can align your contributions to the community"
+      expect(page).to have_css "h2", exact_text: "1. No Poverty"
+      expect(page).to have_content "End poverty in all its forms, everywhere."
+      expect(page).to have_content "1.1 By 2030, eradicate extreme poverty for all people everywhere"
+
+      click_link "7. Affordable and Clean Energy"
+
+      expect(page).not_to have_css "h2", exact_text: "1. No Poverty"
+      expect(page).to have_css "h2", exact_text: "7. Affordable and Clean Energy"
+      expect(page).to have_content "Ensure access to affordable, reliable, sustainable and modern energy."
+      expect(page).to have_content "7.1 By 2030, ensure universal access to affordable"
+
+      click_link "15. Life on Land"
+
+      expect(page).to have_css "h2", exact_text: "15. Life on Land"
+      expect(page).to have_content "Sustainably manage forests, combat desertification, halt and reverse"
+      expect(page).to have_content "15.1 By 2020, ensure the conservation, restoration and sustainable use"
+
+      click_link "Local targets"
+
+      expect(page).not_to have_content "15.1 By 2020, ensure the conservation, restoration and sustainable use"
+      expect(page).to have_content "SDG local target sample text"
+    end
+  end
 end