Use new icons

src/routes/join/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
   import {page} from "$app/stores"
   import {goto} from "$app/navigation"
+  import AltArrowLeft from "@assets/icons/alt-arrow-left.svg?dataurl"
   import Icon from "@lib/components/Icon.svelte"
   import Dialog from "@lib/components/Dialog.svelte"
   import Button from "@lib/components/Button.svelte"
@@ -11,7 +12,7 @@
   <SpaceInviteAccept invite={$page.url.href}>
     {#snippet abortAction()}
       <Button class="btn btn-link" onclick={() => goto("/home")}>
-        <Icon icon="alt-arrow-left" />
+        <Icon icon={AltArrowLeft} />
         Go back
       </Button>
     {/snippet}