Update logo

Author: csyonghe

_layouts/default.html

@@ -26,7 +26,7 @@
   <div id="container">
     <header>
       <div id="innerHeader">
-        <img id="logoContainer" src="/assets/slang-logo.svg">
+        <img id="logoContainer" src="/assets/slang-logo-1.png">
         <div class="main_nav">
           <span class="mainNavItem"><a href="/">Home</a></li></span>
           <span class="mainNavItem"><a href="/docs/getting-started">Getting Started</a></li></span>