Add info about running.

index.html

@@ -52,6 +52,8 @@ include 1991.fs
 \ Start the server on port 8080.
 8080 1991:
 </pre>
+                    <p>You can run the server using <code>gforth app.fs</code>.</p>
+
                     <h2>Logging In II: Logging In, Deeper</h2>
                     <h3>Route Wildcards (Fuzzy Routing / URL Mapping)</h3>
                     <p>