added discrete card style mode option

layouts/_default/single.html

@@ -1,6 +1,6 @@
 {{ define "main" }}
     {{- partial "inject/content-before.html" . -}}
-    <article>
+    <article class="card {{ if .Site.Params.discreteCards }}discrete{{ end }}">
         <h1>{{ .Title }}</h1>
         <p class="date">
             <span title="Date"> </span>

layouts/index.html

@@ -6,7 +6,7 @@
 
     {{/* pagination */}}
     {{ range (.Paginate $postsList).Pages }}
-        <div class="card">
+        <div class="card {{ if .Site.Params.discreteCards }}discrete{{ end }}">
             <h2>
                 <a href="{{ .Permalink }}">{{ .Title }}</a>
             </h2>