Add maintenance mode

src/routes/maintenance-mode/+page.svelte

@@ -0,0 +1,11 @@
+<script>
+    import LargeLogo from "$lib/images/large-logo.svelte";
+
+</script>
+<LargeLogo />
+<h1>
+OwlBoard is down for maintenance
+</h1>
+<p>
+    Maintenance is expected to be complete by 23:59 on 22/11/2024
+</p>