version 4.0 udpate

Complete refactor! Main layout changed, new pages added, build system changed, now uses Gulp 4, Bootstrap SCSS, custom SCSS, new design, dropped Morris and Flot Charts, added Chart.js for charts, new example pages, and more...

scss/navs/sidebar.scss

@@ -68,6 +68,10 @@
           &:active {
             background-color: $gray-300;
           }
+          &.active {
+            color: $primary;
+            font-weight: 700;
+          }
         }
       }
     }
@@ -113,7 +117,6 @@
 
     .sidebar-brand-icon i {
       font-size: 2rem;
-      @include rotate;
     }
     .sidebar-brand-text {
       display: none;