remove unused codes and add site'url configuration on admin

public/admin/css/admin.css

@@ -86,6 +86,9 @@ h2,
 h3 {
   font-family: 'Open Sans', '微软雅黑', Arial, Tahoma, sans-serif;
 }
+.navbar-brand {
+  height: 45px;
+}
 .logo-ctn {
   display: block;
 }

public/admin/css/admin.less

@@ -56,7 +56,9 @@ html,body {
 h1, h2, h3 {
   font-family: @fontFamily;
 }
-
+.navbar-brand {
+	height: 45px;
+}
 .logo-ctn {
 	display: block;
 	#logo {