Add initial hooks for subscription required dialog on unpaid or expired

dashboard/src/components/SubscriptionRequiredDialog.vue

@@ -0,0 +1,21 @@
+<script setup>
+
+import { useTemplateRef } from 'vue';
+import { Dialog, Button } from 'pankow';
+
+const dialog = useTemplateRef('dialog');
+
+defineExpose({
+  async open() {
+    dialog.value.open();
+  }
+});
+
+</script>
+
+<template>
+  <Dialog ref="dialog" title="Subscription required" :show-x="true">
+    <p>To use this feature a Cloudron subscription needs to be set up</p>
+    <Button href="https://console.cloudron.io" target="_blank">Set up</Button>
+  </Dialog>
+</template>