Added postcss-loader to provide fallbacks for older browsers

src/web/stylesheets/index.js

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+/**
+ * Styles index
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ */
+
+/* Libraries */
+import "google-code-prettify/src/prettify.css";
+
+/* Frameworks */
+import "./vendors/bootstrap.less";
+import "bootstrap-switch/dist/css/bootstrap3/bootstrap-switch.css";
+import "bootstrap-colorpicker/dist/css/bootstrap-colorpicker.css";
+
+/* CyberChef styles */
+import "./index.css";