Get rid of some HTML extensions.

Author: fdb

_layouts/base.html

@@ -37,7 +37,7 @@
         <li><a href="/">Homepage</a></li>
         <li><a href="/node/">NodeBox 3<small>Node-based app for generative design and data visualization</small></a></li>
         <li><a href="/opengl/">NodeBox OpenGL<small>Hardware-accelerated cross-platform graphics library</small></a></li>
-        <li><a href="/code/index.php/Home.html">NodeBox 1<small>Generate 2D visuals using Python code (Mac OS X only)</small></a></li>
+        <li><a href="/code/index.php/Home">NodeBox 1<small>Generate 2D visuals using Python code (Mac OS X only)</small></a></li>
       </ol>
     </li>
     <li><a class="gallery" href="/gallery/">Gallery</a></li>

_layouts/documentation.html

@@ -26,37 +26,37 @@ <h1 id="page-title">{{ page.title }}</h1>
     <li>
       <h3>For Beginners</h3>
       <ul>
-        <li><a href="/node/documentation/tutorial/getting-started.html">Getting Started</a></li>
-        <li><a href="/node/documentation/tutorial/exploring.html">Exploring NodeBox</a></li>
-        <li><a href="/node/documentation/tutorial/animation.html">Basic Animation</a></li>
+        <li><a href="/node/documentation/tutorial/getting-started">Getting Started</a></li>
+        <li><a href="/node/documentation/tutorial/exploring">Exploring NodeBox</a></li>
+        <li><a href="/node/documentation/tutorial/animation">Basic Animation</a></li>
       </ul>
     </li>
     <li>
       <h3>Using NodeBox</h3>
       <ul>
-        <li><a href="/node/documentation/using/generative-design.html">Creating Generative Design</a></li>
-        <li><a href="/node/documentation/using/data-visualization.html">Creating Data Visualizations</a></li>
-        <li><a href="/node/documentation/using/animation.html">Working with Animation</a></li>
-        <li><a href="/node/documentation/using/math.html">Working with Math</a></li>
+        <li><a href="/node/documentation/using/generative-design">Creating Generative Design</a></li>
+        <li><a href="/node/documentation/using/data-visualization">Creating Data Visualizations</a></li>
+        <li><a href="/node/documentation/using/animation">Working with Animation</a></li>
+        <li><a href="/node/documentation/using/math">Working with Math</a></li>
       </ul>
     </li>
     <li>
       <h3>Concepts</h3>
       <ul>
-        <li><a href="/node/documentation/concepts/gui.html">The Graphical User Interface</a></li>
-        <li><a href="/node/documentation/concepts/concepts.html">How NodeBox Works</a></li>
-        <li><a href="/node/documentation/concepts/coordinates.html">The Coordinate System</a></li>
-        <li><a href="/node/documentation/concepts/geometry.html">Geometry</a></li>
-        <li><a href="/node/documentation/concepts/subnetworks.html">Subnetworks</a></li>
-        <li><a href="/node/documentation/concepts/randomness.html">Randomness</a></li>
+        <li><a href="/node/documentation/concepts/gui">The Graphical User Interface</a></li>
+        <li><a href="/node/documentation/concepts/concepts">How NodeBox Works</a></li>
+        <li><a href="/node/documentation/concepts/coordinates">The Coordinate System</a></li>
+        <li><a href="/node/documentation/concepts/geometry">Geometry</a></li>
+        <li><a href="/node/documentation/concepts/subnetworks">Subnetworks</a></li>
+        <li><a href="/node/documentation/concepts/randomness">Randomness</a></li>
       </ul>
     </li>
     <li>
       <h3>Expert</h3>
       <ul>
-        <li><a href="/node/documentation/advanced/programming-nodes.html">Writing your own Nodes <strong>(New!)</strong></a></li>
-        <li><a href="/node/documentation/advanced/contributing.html">Contributing To NodeBox</a></li>          
-        <li><a href="/node/documentation/advanced/hacking-nodebox-on-windows.html">Hacking NodeBox on Windows</a></li>          
+        <li><a href="/node/documentation/advanced/programming-nodes">Writing your own Nodes <strong>(New!)</strong></a></li>
+        <li><a href="/node/documentation/advanced/contributing">Contributing To NodeBox</a></li>          
+        <li><a href="/node/documentation/advanced/hacking-nodebox-on-windows">Hacking NodeBox on Windows</a></li>          
       </ul>
     </li>
     <li>