Added icon for YT button

Author: RazviOverflow

assets/css/style.scss

@@ -5,6 +5,7 @@
 
 .btn-github .icon {opacity: 0.6;background: url("../images/github.png") 0 0 no-repeat;}
 .btn-twitter .icon {opacity: 0.6;background: url("../images/twitter.png") 0 0 no-repeat;}
+.btn-youtube .icon {opacity: 0.6;background: url("../images/youtube.png") 0 0 no-repeat;}
 .btn-root-page .icon {opacity: 0.6;background: url("../images/home.png") 0 0 no-repeat;}
 #tags {font-size: 13px;}