wip: working, needs some unit tests for auth functions

component/buttons/sign-out.tsx

@@ -0,0 +1,18 @@
+import { handleSignOut } from "../../auth"
+import { useAuthHeader } from "../../graphql/client"
+import React from "react"
+import { Button } from "react-native"
+
+export default function SignOutButton(): React.JSX.Element {
+  const { setAuthHeader } = useAuthHeader()
+
+  return (
+    <Button
+      title={'Sign out'}
+      onPress={async () => {
+        setAuthHeader({ key: 'Authorization', value: '' })
+        await handleSignOut()
+      }}
+    />
+  )
+}