renderer: add theme switcher, go to about page button in main screen

src/renderer/assets/js/utils/index.js

@@ -1,5 +1,11 @@
+import { shell } from 'electron'
+
 export default class Utils {
   static getCurrentLocale () {
     return navigator?.language?.split('-')[0] || 'en'
   }
+
+  static async openExternal (url) {
+    await shell.openExternal(url)
+  }
 }