title: Github pages makes download markdown files
body: <p>I'm creating a github pages website with this tree in my repository:</p>
  
  <pre><code>|- pages
  |  |- 3.0.3
  |  |  |- SUMMARY.md
  |  |  |- core
  |  |  |  |- String.md
  |- LICENSE.md
  |- README.md
  |- _config.yml
  |- index.md
  </code></pre>
  
  <p>In index.md I wrote</p>
  
  <pre><code>* [0.3.0](pages/0.3.0/SUMMARY.md)
  </code></pre>
  
  <p>and in <code>pages/0.3.0/SUMMARY.md</code></p>
  
  <pre><code>* [String](core/String.md)
  </code></pre>
  
  <p>My problem is this: I can correctly access the main page ('index.md') and <code>pages/0.3.0/SUMMARY.md</code>, but when I want to access <code>String.md</code>
   generated page, github pages makes me download the file instead of loading the .html page.
  What am I doing wrong?</p>
  
  <p><a href="https://lincas-lang.github.io/LinCAS-API/" rel="nofollow noreferrer">Here</a> is the website and <a href="https://github.com/LinCAS-lang/LinCAS-API" rel="nofollow noreferrer">here</a> my repository</p>