Add Nord theme option to theme selection dropdown in Navbar.svelte

src/routes/+layout.svelte

@@ -2,8 +2,8 @@
   export let data;
   import Footer from "$lib/components/Footer.svelte";
   import Navbar from "$lib/components/Navbar.svelte";
+  import type { SubmitFunction } from "@sveltejs/kit";
   import "../app.css";
-  // only show footer if scrolled to the bottom
 </script>
 
 <!-- passes the user object to the navbar component -->

src/routes/+page.server.ts

@@ -31,7 +31,7 @@ export const actions: Actions = {
   setTheme: async ( { url, cookies }) => {
     const theme = url.searchParams.get("theme");
     // change the theme only if it is one of the allowed themes
-    if (theme && ["light", "dark", "night", "retro", "forest"].includes(theme)) {
+    if (theme && ["light", "dark", "night", "retro", "forest", "nord"].includes(theme)) {
       cookies.set("colortheme", theme, {
         path: "/",
         maxAge: 60 * 60 * 24 * 365,