[Feature Request] Show graph : include 'dot' application in release

### **Initial condition:**
Postgresql db with dvdrental image
lino dataconnector add dvdrental --read-only postgresql://postgres@localhost:5432/dvdrental?sslmode=disable --password
lino relation extract dvdrental
lino table extract dvdrental
lino id create "film"

### **Action**
lino id show-graph

### **Problem**
exec: "dot": executable file not found in %PATH%

### **Expected 1/3**
Either the release is completed to include the DOT application (best solution !) or the installation process is completed to describe that DOT should be installed.

### **Expected 2/3**
in URL 'https://github.com/CGI-FR/LINO/issues' the example is
$ lino id customer show-graph
With 'customer' which looks like a table name.
but with command 'lino id "film" show-graph' => the help 'lino id' is displayed.
=> is it possible to fix the example and remove the 'customer' word

### **Expected 3/3**
after calling command 'lino id "film" show-graph' => the help 'lino id' is displayed.
=> Is it possible to have an error message because after 'lino id ' the "film" string is not a valid [command]
extract from lino id --help:
Usage:
lino id [command]