title: How to make a Django admin readonly textarea field
body: <p>In Django admin, if I have a model field that's a <code>TextField</code> and set it as readonly using <code>readonly_fields</code>, then it's displayed as text in a <code>&lt;p&gt;</code> tag.</p>
  
  <p>I'd like it to still be displayed as a <code>textarea</code> field, but with its <code>disabled</code> attribute set.</p>
  
  <p>What's the simplest way to accomplish this?</p>