1. Odoobot shouldn't talk to admin when demo data are installed
Odoobot will talk to a user on it's first connection, meaning that
a dev will see this chat window a lot. The state disabled is not a
real state but is explicit, the odoobot wont be initialized in this
case. It is still possible to test odoobot flow with demo user.
2. remove old odoobot image and update link
3. small improvements in odoobot answers