NextJS-Auth0 handleAuth custom error handling

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When you detect an error, you need to explicitly log the user out. This is roughly what we do:

res
  .redirect(
    302,
    `${auth0Config.issuerBaseUrl}/v2/logout?${new URLSearchParams({
      client_id: auth0Config.clientId,
      returnTo: `${auth0Config.baseUrl}welcome`
    })}`
  )
  .end();

Curiously, using the logout URL from […auth0].ts did NOT work. We had to use the URL shown above.