Update to latest Kit and handle breaking changes (#270)

packages/site-kit/src/lib/components/NavItem.svelte

@@ -11,7 +11,7 @@
 {:else}
 	<li>
 		<a
-			aria-current={$page.path.startsWith(href) ? true : undefined}
+			aria-current={$page.url.pathname.startsWith(href) ? true : undefined}
 			sveltekit:prefetch
 			{href}
 			{title}

packages/site-kit/src/lib/docs/Main.svelte

@@ -15,7 +15,7 @@
 			if (heading.nodeName.startsWith('H') && !heading.querySelector('a')) {
 				const a = document.createElement('a');
 				a.className = 'anchor';
-				a.href = `${$page.path}#${heading.id}`;
+				a.href = `${$page.url.pathname}#${heading.id}`;
 				const span = document.createElement('span');
 				span.className = "visually-hidden";
 				span.innerHTML = "permalink";
@@ -45,15 +45,15 @@
 					const { id } = heading;
 
 					if (id !== last_id) {
-						path = `${$page.path}#${id}`;
+						path = `${$page.url.pathname}#${id}`;
 						last_id = id;
 					}
 
 					return;
 				}
 			}
 
-			path = $page.path;
+			path = $page.url.pathname;
 		};
 
 		window.addEventListener('scroll', onscroll, true);