ENYO-1020: add /favicon.ico (avoid 404 in the logs...)

- remove former ares.png files fetched from the Net with random license
- add icon from Ares1 (https://ares.palm.com) as favicon.ico

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>