Refactor `Auth0Controller` in 01-login.md (#9985)
Refactor `Auth0Controller` in 01-login.md (#9985)

I updated this page with these changes:

* Fix typo: `informatin` => `information `
* Replace the custom `to_query` with `Hash#to_query` defined by Rails
* Remove `AUTH0_CONFIG` in `Auth0Controller` because it's already declared
  in the initializer
auth0/docs,auth0/docs,auth0/docs