Add burrow support

src/app/components/SignUpSuccess.svelte

@@ -0,0 +1,18 @@
+<script lang="ts">
+  import Button from "@lib/components/Button.svelte"
+  import LogInBurrow from "@app/components/LogInBurrow.svelte"
+  import {pushModal} from "@app/modal"
+
+  export let email
+
+  const login = () => pushModal(LogInBurrow)
+</script>
+
+<div class="column gap-4">
+  <h1 class="heading">Success!</h1>
+  <p class="m-auto max-w-sm text-center">
+    A confirmation email has been sent to {email}.
+  </p>
+  <p>Once you've confirmed your account you'll be redirected to the login page.</p>
+  <Button class="btn btn-primary" on:click={login}>Back to Login</Button>
+</div>