title: Exclude particular file from GitHub search
body: <p>I would like to know if and how you can exclude from the search results all the repositories that contain a certain type of file.</p>
  
  <p>Specifically, I'm not interested in any kind of project that uses Composer and so I would like to exclude from the search results all the repositories that contain the <code>composer.json</code> file as they are many, occupy completely useless pages and pages that I will never open.</p>