[Management] Update (some) data less often about dietpi-dashboard

[ravenclaw900]

This goes for the services page too, currently it's updated every 2 seconds, for the rare occasion (i.e. if it's started so recently that the time is still measured in seconds) that you want to update the time there.

[ravenclaw900]

I'm probably going to change it to minutes for the management page, and not update it, and also not update the services page at all.

[MichaIng]

Sounds reasonable.

[MichaIng]

Ah totally right. There it is even more an issue since dietpi-services with all it's systemctl calls causes much higher CPU load.

Same for Processes, but there it makes sense to monitor CPU and RAM usage, like on the main/Statistics page, obviously.

In the future we could add a live update checkbox and probably even an option for the update rate.