Add is:inline to the script tag

Author: KollPotato

docs/src/layouts/MainLayout.astro

@@ -4,7 +4,7 @@ import TopNav from "../components/TopNav.astro";
 import Footer from "../components/Footer.astro";
 ---
 
-<script>
+<script is:inline>
   // On page load or when changing themes, best to add inline in `head` to avoid FOUC
   if (
     localStorage.theme === "dark" ||