improve index.html interface with ninja template

site/assets/less/main-horizontal.less

@@ -0,0 +1,13 @@
+/* Include variables for LESS */
+@import "variables.less";
+/* Import file styles */
+@import 'https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700';
+@import url(../fonts/font-awesome/css/font-awesome.min.css);
+@import url(../plugin/bootstrap/css/bootstrap.min.css);
+@import url(../plugin/nprogress/nprogress.css);
+/* General css */
+@import "general.less";
+/* Header */
+@import "header-horizontal.less";
+/* Style */
+@import "style.less";