Commented out chat example, as it is broken atm

docs/Embed.md

@@ -78,10 +78,11 @@ Mongoose source code contains a well-commented example code, listed below:
    * [hello.c](https://github.com/cesanta/mongoose/blob/master/examples/hello.c)
    shows how to handle form input, file upload, websocket communication, get
    cookie values.
-
+   <!--
    * [chat](https://github.com/cesanta/mongoose/blob/master/examples/chat)
    implements basic online chat functionality using Lua scripting capabilities
    of Mongoose. Not a single line of C is written for that example.
    Demostrates usage of database, cookie-based authentication, session
    support, RESTful interface. No additional software is required to run it
    on any platform.
+   -->