Remove unused update function from budget layout and add update functionality to settings page

src/routes/+layout.svelte

@@ -7,11 +7,6 @@
 		amount: 0,
 		notes: ''
 	});
-	async function update() {
-		let res = await fetch('/api/simplefin/update', {
-			method: 'POST'
-		});
-	}
 	async function saveBudget() {
 		let res = await fetch('/budget', {
 			method: 'POST',
@@ -44,9 +39,6 @@
 	<div class="drawer-side">
 		<label for="my-drawer-2" aria-label="close sidebar" class="drawer-overlay"></label>
 		<ul class="menu bg-base-200 text-base-content min-h-full w-80 p-4">
-			<li>
-				<button onclick={update}>Update</button>
-			</li>
 			<li><div class="divider">Budgets</div></li>
 			{#each budgets as budget}
 				<li>

src/routes/settings/+page.svelte

@@ -2,8 +2,16 @@
     let { data } = $props();
     let accounts = $derived(data.accounts || []);
     let budgets = $derived(data.budgets || []);
+
+	async function update() {
+		let res = await fetch('/api/simplefin/update', {
+			method: 'POST'
+		});
+	}
 </script>
 
+<button onclick={update}>Update</button>
+
 <div class="flex flex-col gap-4">
     <h1 class="text-2xl font-bold">Settings</h1>
     <div class="mb-4">