title: Github page links behave differently offline and online
body: <p>I have a small <a href="http://simonh1000.github.io/" rel="nofollow">github pages site</a>. Offline - using Jekyll - I need to set up links to e.g. <code>/blog.html</code> but these do not work online, where I seem to need <code>/blog</code>. But the latter does not work offline. How can I get the same behaviour offline and online?</p>
  
  <pre><code>/ index.html
  - blog.html
  - decoder.md
  -   / _includes
      - navbar.html
  </code></pre>
  
  <p>And this in navbar.html</p>
  
  <pre><code>    &lt;div class="navbar-collapse collapse" id="topbar"&gt;
          &lt;ul class="nav navbar-nav navbar-right"&gt;
              &lt;li&gt;&lt;a href="/blog"&gt;Blog&lt;/a&gt;&lt;/li&gt;
              &lt;!-- &lt;li&gt;&lt;a href="/blog.html"&gt;Blog&lt;/a&gt;&lt;/li&gt; --&gt;
              &lt;li&gt;&lt;a href="/decoder"&gt;Elm Json tester&lt;/a&gt;&lt;/li&gt;
          &lt;/ul&gt;
      &lt;/div&gt;
  </code></pre>