Added Navbar, Header and App

public/styles/tools/_gradients.scss

@@ -0,0 +1,13 @@
+/*
+ *  Gradients
+ *    Various cross browser gradients
+ *
+ *  Version:
+ *    1.0.0 - 2018/02/23
+ */
+ @mixin t-gradient-directional($start-color: #555, $end-color: #333, $deg: 45deg) {
+  background-repeat: repeat-x;
+  background-image: -webkit-linear-gradient($deg, $start-color, $end-color); // Safari 5.1-6, Chrome 10+
+  background-image: -o-linear-gradient($deg, $start-color, $end-color); // Opera 12
+  background-image: linear-gradient($deg, $start-color, $end-color); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
+}