Added 'cloud storage' functionality

FastNotes/components/social-auth-buttons/sign-out-button.tsx

@@ -0,0 +1,19 @@
+import { supabase } from '@/libs/supabase'
+import { router } from 'expo-router'
+import React from 'react'
+import { Button } from 'react-native'
+
+async function onSignOutButtonPress() {
+  const { error } = await supabase.auth.signOut()
+
+  if (error) {
+    console.error('Error signing out:', error)
+    return
+  }
+
+  router.replace('/login')
+}
+
+export default function SignOutButton() {
+  return <Button title="Sign out" onPress={onSignOutButtonPress} />
+}