[Feature Request] update Password documentation for 'Connection string'

### **Initial condition:**
follow instruction in 'https://github.com/CGI-FR/LINO'

### **Action**
lino dataconnector add source postgresql://postgres:@localhost:5432/postgres?sslmode=disable

### **Problem**
warning is displayed :
"warn: password should not be included in URI, use --password-from-env or --password"

### **Expected**
'https://github.com/CGI-FR/LINO' should be updated to remove password from connection string and replace it with parameter '--password'.With this parameter, the operator is asked to enter the password in a secured way.