refactor(dsfr): CardComponent with footer_buttons slot

app/components/dsfr/card_component.rb

@@ -1,15 +1,12 @@
 class Dsfr::CardComponent < ApplicationComponent
-  def footer_button(*args)
-    @footer_buttons.push args
-  end
+  renders_many :footer_buttons
 
   private
 
-  def initialize(title: nil, desc: nil, footer_buttons: [])
+  def initialize(title: nil, desc: nil)
     @title = title
     @desc = desc
-    @footer_buttons = footer_buttons
   end
 
-  attr_reader :title, :desc, :footer_buttons
+  attr_reader :title, :desc
 end

app/components/dsfr/card_component/card_component.html.haml

@@ -2,15 +2,16 @@
   .fr-card__body
     .fr-card__content
       - if title
-        %h1.fr-card__title
+        %h2.fr-card__title
           = title
       - if desc
         %p.fr-card__desc
           = desc
 
-    - if footer_buttons.any?
+    - if footer_buttons?
       .fr-card__footer
         .fr-btns-group.fr-btns-group--inline-reverse.fr-btns-group--inline-lg
           %ul
-            %li
-              = render Dsfr::ButtonComponent.with_collection(footer_buttons)
+            - footer_buttons.each do |button|
+              %li
+                = button