Fix repl iframe (#61)

Signed-off-by: James Hamlin <[email protected]>

Author: jfhamlin

doc/index.html

@@ -40,7 +40,7 @@
           <p>Loading REPL...</p>
           <p class="text-sm">This may take a few seconds</p>
         </div>
-        <iframe src="/repl" width="800px" height="500px" frameborder="0" />
+        <iframe src="./repl" width="800px" height="500px" frameborder="0" />
       </div>
 
     </div>