Add canonical link tags

src/routes/+layout.svelte

@@ -3,6 +3,7 @@
   import '$lib/main.css';
   import { dev } from '$app/environment';
   import DevBanner from '$lib/DevBanner.svelte';
+  import { page } from '$app/stores';
 </script>
 
 <svelte:head>
@@ -14,6 +15,7 @@
   />
   <meta name="viewport" content="width=device-width" />
   <meta name="theme-color" content="#00b7b7" />
+  <link rel="canonical" href="https://owlboard.info{$page.url.pathname}" />
   <link rel="icon" href="/images/icon.svg" type="image/svg+xml" />
   <link rel="apple-touch-icon" href="/images/app-icons/any/apple-192.png" />
   <link rel="manifest" href="/manifest.json" />