add documentation

apps/docs/src/components/personal-data-warning.tsx

@@ -0,0 +1,10 @@
+import { Callout } from 'nextra/components';
+
+export function PersonalDataWarning() {
+  return (
+    <Callout emoji="⚠️">
+      Keep in mind that this is considered personal data. Make sure you have the
+      users consent before calling this!
+    </Callout>
+  );
+}