title: Rails - single user to update the site
body: <p>I am creating my first every Rails site and I started using the Devise gem to create a login for myself, so I can add content (for example I want to add a new movie review).</p>
  
  <p>Since I am the only one using the site - how do I hide and disable the sign_up URL so that no one else can sign up?</p>
  
  <p>Do I just keep the "/users/sign_in" URL hidden so that only I know it? 
  How do I prevent anyone else from signing up?</p>
  
  <p>Is there a better way to do this without using devise?</p>
  
  <p>Many Thanks</p>