doc: remove live link to fractaldemo.com

The website www.fractaldemo.com no longer exists. Such is the internet.

Fixes #379

Author: johnbartholomew

doc/articles/fractal.1.html

@@ -82,9 +82,8 @@ <h2 id=app>Example Web Application</h2>
         The example application allows the user to zoom and pan a Mandelbrot fractal (dynamically
         rendered server side, in C++).  The user is able to save the location of features they find,
         deep in the fractal, and a time-ordered list of these with thumbnails is displayed in the
-        left hand pane.  The application is provisionally hosted <a
-        href="http://www.fractaldemo.com/">here</a>, but you can easily deploy your own as all
-        required files are available in the Jsonnet repository.
+        left hand pane.  All required files are available in the Jsonnet repository if you want to
+        deploy this yourself.
       </p>
       <p>
         Although admittedly a little contrived, this example is intended to represent the structure