title: Links on Github-Pages while using a theme
body: <p>So i'm building a small website on gh-pages and i'm using a gh-pages markdown theme. 
  To implement a navigation bar i've slightly modified the "default.html" file to also feature a bar inside the header.
  Now i'd like to link or navigate between pages while still keeping the theme, header and such. But when using 
  <code>&lt;a href="anotherPage.md"&gt;Another Page&lt;/a&gt;</code>
  it reloads an entire new blank page.
  But when first visiting <code>https://myPersonalPage.github.io/</code> it loads up just fine and it does load index.md properly.</p>
  
  <p>So in short, I'd like to change the content of a gh-page without changing the header and I don't know how.</p>
  
  <p>In the default.html file my links look like this:</p>
  
  <pre><code>&lt;!-- HEADER --&gt;
  &lt;div id="header_wrap" class="outer"&gt;
      &lt;header class="inner"&gt;
          &lt;h1 id="project_title"&gt;MyProjects&lt;/h1&gt;
          &lt;div id="navbar"&gt;
              &lt;ul&gt;
                  &lt;li&gt;&lt;a href="index.md"&gt;HOME&lt;/a&gt;&lt;/li&gt;
                  &lt;li&gt;&lt;a href="projects.md"&gt;PROJECTS&lt;/a&gt;&lt;/li&gt;
                  &lt;li&gt;&lt;a href="aboutMe.md"&gt;ABOUT ME&lt;/a&gt;&lt;/li&gt;
              &lt;/ul&gt;
          &lt;/div&gt;
      &lt;/header&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>And in the default.html file the content-load looks like this:</p>
  
  <pre><code>&lt;!-- MAIN CONTENT --&gt;
  &lt;div id="main_content_wrap" class="outer"&gt;
      &lt;section id="main_content" class="inner"&gt;
          {{ content }}
      &lt;/section&gt;
  &lt;/div&gt;
  </code></pre>