Change logo to be background image, better for responsive purpose

theme/templates/base.html

@@ -28,7 +28,7 @@
     <header id="banner" class="body">
       <div id="headerContainer">
         <div id="logo">
-          <a href="{{ SITEURL }}/index.html"><img src="{{ SITEURL }}/{{ THEME_STATIC_DIR }}/images/logo_blc.png" alt="{{ SITENAME }}"></a>
+          <a href="{{ SITEURL }}/index.html"></a>
         </div>
         <nav>
           <ul>