From the version 1.4.0 the project supports single restaurant version. To enable this option you will need to make these steps:
Chande the environment variable SINGLE_MODE from false to true.
Open your database using phpMyAdmin on your shared hosting or just simply open Adminer. (Adminer is php script to manage your database). The Adminer is located on yourdomain.com/adminer
There, login with your database username and password.
Open restorants table and find the restaurant that you want to use in your project.
Find the column id and see which number ID is used for that restaurant.
Now add the restaurant id in the following environment variable.
SINGLE_MODE_ID=1 //Restaurant id