feat: Add header styles inclusion

Author: Lunyachek

src/App.scss

@@ -10,6 +10,7 @@ $fa-font-path: "~font-awesome/fonts";
 $input-focus-box-shadow: $input-box-shadow; // hack to get upgrade to paragon 4.0.0 to work
 
 @import "~@edx/frontend-component-footer/dist/_footer";
+@import "~@edx/frontend-component-header/dist/index";
 
 #root {
   display: flex;