Fix building error

gridsome.config.js

@@ -1,5 +1,6 @@
 module.exports = {
   siteName: 'Ryujinx',
+  siteUrl: 'https://www.ryujinx.org',
   titleTemplate: 'Ryujinx - %s',
   plugins: []
 }

src/layouts/Default.vue

@@ -208,7 +208,7 @@ a {
 export default {
   data() {
     return {
-      dark: localStorage.dark_mode === "true",
+      dark: process.isClient && localStorage.dark_mode === "true",
       drawer: false,
       title: "Ryujinx - Switch Emulator"
     };