Ajouter les logos sur fond blanc

Refs #9 (closed)

themes/hugo-theme-relearn/static/css/home.css

@@ -78,6 +78,7 @@ footer li.logo {
 }
 
 footer li.logo > a > img {
+    background-color: #fff;
     height: 32px;
     position: relative;
     top: 11px;