Remove dead link from demo slides

examples/classic-slides/index.html

@@ -325,7 +325,7 @@
   * ...have it automatically converted to HTML
   * Markdown is converted into a presentation client side, in the browser. This is unlike
    existing tools like [Hovercraft](https://github.com/regebro/hovercraft) and 
-   [markdown-impress](http://binbinliao.com/markdown-impress/) where you generate a new
+   markdown-impress where you generate a new
    html file on the command line.
 * [A more advanced Markdown presentation is here.](../markdown/)
     </div>

examples/markdown/index.html

@@ -49,7 +49,7 @@
 * Jot down your bullet points in *Markdown* & have it automatically converted to HTML
 * Note: The Markdown is converted into a presentation client side, in the browser. This is unlike
   existing tools like [Hovercraft](https://github.com/regebro/hovercraft) and 
-  [markdown-impress](http://binbinliao.com/markdown-impress/) where you generate a new
+  markdown-impress where you generate a new
   html file on the command line.
 * This combines the ease of typing Markdown with the full power of impress.js HTML5+CSS3+JavaScript!