add png fallback for logo

Author: christopheschwyzer

css/main.css

@@ -204,6 +204,9 @@ strong {
   height: 100%;
   background: url(/img/logo.svg) no-repeat center;
 }
+html.no-svg #header .logo-wrapper .logo {
+  background: url(/img/logo.png) no-repeat center;
+}
 #header .logo-wrapper .slogan {
   display: block;
   font-style: italic;

css/main.less

@@ -241,6 +241,10 @@ strong {
 			max-width: 100%;
 			height: 100%;
 			background: url(/img/logo.svg) no-repeat center;
+
+			html.no-svg & {
+				background: url(/img/logo.png) no-repeat center;
+			}
 		}
 
 		.slogan {