fix: correct theme toggle icon

astro.config.mjs

@@ -1,6 +1,7 @@
 import { defineConfig } from 'astro/config';
 import { i18n, filterSitemapByDefaultLocale } from "astro-i18n-aut/integration";
 import sitemap from "@astrojs/sitemap";
+import Icons from 'unplugin-icons/vite'
 import mdx from '@astrojs/mdx';
 import glsl from 'vite-plugin-glsl';
 
@@ -24,6 +25,9 @@ export default defineConfig({
   vite: {
     plugins: [
       glsl(),
+      Icons({
+        compiler: 'svelte',
+      }),
     ],
   },
   integrations: [