MOBILE-3320 theme: Move styles into theme folder

angular.json

@@ -33,10 +33,7 @@
             ],
             "styles": [
               {
-                "input": "src/theme/variables.scss"
-              },
-              {
-                "input": "src/global.scss"
+                "input": "src/theme/global.scss"
               }
             ],
             "scripts": [],

src/theme/global.scss

@@ -9,6 +9,8 @@
  * https://ionicframework.com/docs/layout/global-stylesheets
  */
 
+/* Application styles */
+@import "./variables.scss";
 
 /* Core CSS required for Ionic components to work properly */
 @import "~@ionic/angular/css/core.css";