Add and apply Capybara/ClickLinkOrButtonStyle rule

This rule was added in rubocop-capybara 2.19.0. We were following it
most of the time.

spec/system/home_spec.rb

@@ -92,7 +92,7 @@ describe "Home" do
         visit root_path
 
         within("#section_recommended") do
-          click_on debate.title
+          click_link debate.title
         end
 
         expect(page).to have_current_path(debate_path(debate))