B2B-88: add starter kit structure and elements

packages/supabase/src/hooks/use-sign-out.ts

@@ -0,0 +1,13 @@
+import { useMutation } from '@tanstack/react-query';
+
+import { useSupabase } from './use-supabase';
+
+export function useSignOut() {
+  const client = useSupabase();
+
+  return useMutation({
+    mutationFn: () => {
+      return client.auth.signOut();
+    },
+  });
+}