Feature/istwcms 4695 ebremner theme banners

source/_patterns/04-components/card/card--banner/card--banner.twig

@@ -2,6 +2,7 @@
   {% include '@components/card/card.twig' with {
     sources: image.sources,
     img_element: image.img_element,
+    alt: image.alt,
     type: 'banner',
     title: image.big_text,
     sub_title: image.small_text,