Reboot autorefresh timeout is too short

[Stefal]

Describe the bug
When you click on "Reboot" the web page try to refresh after 60s but can't load the page.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Settings'
2. Click on 'Reboot'
3. Wait 60s
4. See error

Software/Hardware (please complete the following information):

• RTKBase release number 2.6.1
• OS: Armbian 64bits
• SBC Orange Pi Zero

Additional context
Since the switch to gunicorn, the shutdown process is a little slower. The entire reboot process seems to take a little longer than 60s.

I should raise up this 60s value, or find a way to autodetect when the base station is online then refresh the web page.