Adding some SEO metadata (#1474)

* Add breadcrumbs

* Update cardv2.html

* Dark mode fix

_layouts/page.html

@@ -2,6 +2,8 @@
 layout: default
 ---
 
+{% include breadcrumbs.html %}
+
 <div class="jumbotron p-5">
   <h1 class="display-4">{{ page.title }}</h1>
   {% if page.description and page.hidedesc != true %}<p class="lead">{{ page.description }}</p>{% endif %}