refactor: move scss to assets

src/assets/scss/style.scss

@@ -0,0 +1,8 @@
+// If you want to override variables do it here
+@import "variables";
+
+// Import styles
+@import "~@coreui/coreui/scss/coreui";
+
+// If you want to add something do it here
+@import "custom";