title: Jekyll different permalinks for posts than other pages
body: <p>I am using <code>permalink: pretty</code> for all of my site (static pages).</p>
  
  <p>However for blog posts, I would like to use <code>permalink: /blog/:year/:month/:day/:title/</code>.</p>
  
  <p>How do I set two different permalink styles?</p>