title: Add authentication for certain pages of Jekyll site
body: <p>I have a certain page my Jekyll site that I only want to make available to people from my organization's domain (call it example.com).</p>
  
  <p>Am I correct in my understanding that it's not possible to restrict access to certain pages because — as is the nature of a static site  — everything has already been served at once?</p>
  
  <p>I'm aware of the <code>jekyll-auth</code> plugin to authenticate users against GitHub, but my situation would require that authentication through Google sign-in.</p>