:bug: export sort type helper

vue-theme/src/components/navigation/navigation.vue

 </template>
 
 <script>
-import { postTypes } from '@/utils/helpers'
+import { postTypes, sortTypes } from '@/utils/helpers'
 import { computed } from '@vue/runtime-core'
 
 export default {
         }
         
         return {
+            sortTypes,
             menuItems,
             uncheck
         }