Refactor code to remove unused variable and add meta tags for shared collections page

frontend/src/routes/collections/[id]/+page.svelte

@@ -50,7 +50,6 @@
 
 	let notFound: boolean = false;
 	let isShowingLinkModal: boolean = false;
-	let isShowingCreateModal: boolean = false;
 	let isShowingTransportationModal: boolean = false;
 	let isShowingChecklistModal: boolean = false;
 

frontend/src/routes/shared/+page.svelte

@@ -25,3 +25,8 @@
 		{/if}
 	</p>
 {/if}
+
+<svelte:head>
+	<title>Shared Collections</title>
+	<meta name="description" content="Collections shared with you by other users." />
+</svelte:head>