Re-work invite links

src/routes/join/+page.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+  import {page} from "$app/stores"
+  import {goto} from "$app/navigation"
+  import Icon from "@lib/components/Icon.svelte"
+  import Dialog from "@lib/components/Dialog.svelte"
+  import Button from "@lib/components/Button.svelte"
+  import SpaceInviteAccept from "@app/components/SpaceInviteAccept.svelte"
+</script>
+
+<Dialog>
+  <SpaceInviteAccept invite={$page.url.href}>
+    {#snippet abortAction()}
+      <Button class="btn btn-link" onclick={() => goto("/home")}>
+        <Icon icon="alt-arrow-left" />
+        Go back
+      </Button>
+    {/snippet}
+  </SpaceInviteAccept>
+</Dialog>