fix typo

website/index.html

@@ -141,7 +141,7 @@ Server running at http://127.0.0.1:8000/</pre>
         being used.  Processes are necessary to scale to multi-core
         computers, not memory-sharing threads. The fundamentals of scalable
         systems are fast networking and non-blocking design&mdash;the rest
-        is message passing.  In the future, I'd like Node to to be able to
+        is message passing.  In the future, I'd like Node to be able to
         spawn new processes (probably using the
         <a href="http://www.whatwg.org/specs/web-workers/current-work/">
           Web Workers API