Silence warnings about referrers

svelte/src/file_viewer/CustomBanner.svelte

@@ -7,7 +7,7 @@ export let border_top = false;
 {#if src}
 	<div class:border_top>
 		{#if link}
-			<a href={link} target="_blank">
+			<a href={link} target="_blank" rel="noreferrer">
 				<img class="image" src="{src}" alt="User-provided banner"/>
 			</a>
 		{:else}

svelte/src/file_viewer/DetailsWindow.svelte

@@ -209,7 +209,7 @@ onMount(() => {
 	<Chart bind:this={chart} />
 
 	<p style="text-align: center">
-		Charts rendered by the amazing <a href="https://www.chartjs.org/" target="_blank">Chart.js</a>.
+		Charts rendered by the amazing <a href="https://www.chartjs.org/" target="_blank" rel="noreferrer">Chart.js</a>.
 	</p>
 
 	<h3>Keyboard Controls</h3>

svelte/src/file_viewer/viewers/RateLimit.svelte

@@ -49,7 +49,7 @@ let file = {
 	{/if}
 	<p>
 		This warning disappears when the you are a
-		<a href="https://www.patreon.com/join/pixeldrain/checkout?rid=5736701&cadence=12" target="_blank">Patreon supporter</a>,
+		<a href="https://www.patreon.com/join/pixeldrain/checkout?rid=5736701&cadence=12" target="_blank" rel="noreferrer">Patreon supporter</a>,
 		or when the uploader of the file enables
 		<a href="/user/subscription">bandwidth sharing</a> on their Pro account
 		(and their data cap has not been used up). Using a download manager with