Fix(styles): remove unused export scss variables

Author: Armour

src/styles/_variables.scss

@@ -26,9 +26,6 @@ $loginCursorColor: #fff;
 // The :export directive is the magic sauce for webpack
 // https://mattferderer.com/use-sass-variables-in-typescript-and-javascript
 :export {
-  subMenuBg: $subMenuBg;
-  subMenuHover: $subMenuHover;
-  subMenuActiveText: $subMenuActiveText;
   menuBg: $menuBg;
   menuText: $menuText;
   menuActiveText: $menuActiveText;

src/styles/_variables.scss.d.ts

@@ -1,11 +1,7 @@
 export interface IScssVariables {
-  subMenuBg: string
-  subMenuHover: string
-  subMenuActiveText: string
+  menuBg: string
   menuText: string
   menuActiveText: string
-  menuBg: string
-  menuHover: string
 }
 
 export const variables: IScssVariables