title: How to include header File in HTML
body: <p>I have the following file structure
  I am trying to take the header.html from the _includes directory, and import it into the index.html file so that the text from it shows up in the main file(index.html)</p>
  
  <p>I have already tried this <code>{% include header.html %}</code> but all that shows up is <code>{% include header.html %}</code> instead of the text that is in header.html</p>