Add images to front page.

layouts/_default/li.html

@@ -8,6 +8,9 @@
       </time>
     </p>
   </header>
+  {{ with .Params.image }}
+    <img src="{{ . }}" alt="thumbnail" class="c-article__thumbnail">
+  {{ end }}
   <div class="c-article__summary">
     {{ .Summary | plainify | safeHTML }}
   </div>

static/css/style.css

@@ -266,6 +266,10 @@ img {
     margin: 0;
 }
 
+.c-article__thumbnail {
+    margin-bottom: 10px;
+}
+
 .c-article__btn {
     display: inline-block;
     padding-bottom: 4px;