Update screen blanking

[jehlers42]

re: issue #2959

Removed instructions on adjusting the blank interval via the config file. Internal discussion led to encouraging changes solely through raspi-config or the config GUI.

[aallan]

Closes #2959

[aallan]

It's not Monday, but it feels like it sometimes… 🙄

[lurch]

I just noticed that the text just beyond the change in this PR also talks about "sudo apt install xscreensaver" - we probably don't want that, as Bookworm / Wayland comes with a screensaver built in by default? (It displays a rotating-cube of the desktop)
(and I'd guess that a program named xscreensaver might not work on Wayland?)

ping @spl237 for thoughts / comments

[aallan]

(and I'd guess that a program named xscreensaver might not work on Wayland?)

I'd guess it will not work on Wayland. Probably should pull the reference in any case, it's not going to be needed, Wayland comes with it built in. @jehlers42 can you PR something to pull that ref. Thanks.

[jehlers42]

Since that section mentions finding the xscreensaver app in Preferences, will the new built-in screensaver have a similar location for options relating to it or should I just remove the entire screensaver bit.

[aallan]

I'd lean towards just removing it.