- update: Bootstrap version to v4.0.0-beta.2

- update: vue-chartjs version to 3.0.0
- refactor: Remove old SCSS variables
- refactor: Breadcrumb Menu styles
- fix: External links issue
- fix: Mobile sidebar-nav height issue

Vue_Starter/scss/bootstrap/bootstrap-grid.scss

@@ -1,14 +1,12 @@
-// Bootstrap Grid only
-//
-// Includes relevant variables and mixins for the flexbox grid
-// system, as well as the generated predefined classes (e.g., `.col-sm-4`).
-
-//
-// Box sizing, responsive, and more
-//
+/*!
+ * Bootstrap Grid v4.0.0-beta.2 (https://getbootstrap.com)
+ * Copyright 2011-2017 The Bootstrap Authors
+ * Copyright 2011-2017 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
 
 @at-root {
-  @-ms-viewport { width: device-width; }
+  @-ms-viewport { width: device-width; } // stylelint-disable-line at-rule-no-vendor-prefix
 }
 
 html {