updating to 4.0

New design with breaking changes, gulp 4, all dependencies updated, dev environment changed, and many more changes

vendor/fontawesome-free/scss/v4-shims.scss

@@ -0,0 +1,6 @@
+/*!
+ * Font Awesome Free 5.6.3 by @fontawesome - https://fontawesome.com
+ * License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
+ */
+@import 'variables';
+@import 'shims';