Update default.html

Author: sangam14

_layouts/default.html

@@ -23,7 +23,7 @@
 
 
     <header class="page-header" role="banner">
-      <center><a href="http://dockerlabs.collabnix.com"><img src="https://raw.githubusercontent.com/collabnix/dockerlabs/master/ic_launcher.png" ></a></center>
+      <center><a href="http://dockerlabs.collabnix.com"><img src="https://raw.githubusercontent.com/collabnix/gopherlabs/master/img/ic_launcher.png" ></a></center>
       <!-- Place this tag where you want the button to render. -->
 <a class="github-button" href="https://github.com/Collabnix/dockerlabs" data-size="large" data-show-count="true" aria-label="Star Collabnix/dockerlabs on GitHub">Star</a>
       <!-- Place this tag where you want the button to render. -->