Add redirection logic so that users going to:

    http://localhost:8080/

will be correctly redirected to the openHAB Demo HTML Page.  This redirect includes an index.html file, in the webapps/static directory, that can be modified by the consumer to target a different interface.

NOTE: This change uses a Browser-redirect, instead of a Server-rewrite, since the `RewriteHandler` doesn't appear to rewrite the context from null to `/static/`  All openHAB servlets have hooked themselves into the root context handler, so the `DefaultHandler` (for content in the FS) doesn't get a shot at the request.