update Configuration to use websocket inside nginx

[composercodes]

Please update the script to use WebSocket inside nginx reference https://www.odoo.com/documentation/16.0/administration/install/deploy.html#id7

[Yenthe666]

Thanks for pointing that out, good idea :) Feel free to make a PR if you have time, otherwise it might stay open for a bit (for now).

[wm-cortex]

@Yenthe666 I made #377 PR for replacing longpolling with websocket.