kscreenctl: add page (#23512)

pages/linux/kscreenctl.md

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+# kscreenctl
+
+> Manage display outputs on KDE Plasma.
+> See also: `kscreen-doctor`, `kscreen-console`.
+> More information: <https://invent.kde.org/plasma/kscreen>.
+
+- List all connected outputs:
+
+`kscreenctl list-outputs`
+
+- Show an on-screen label on each monitor to identify connector names:
+
+`kscreenctl identify`
+
+- Show information about a specific output (or use `active-output` / `primary-output`):
+
+`kscreenctl {{DP-1}}`
+
+- Set the resolution and refresh rate of an output:
+
+`kscreenctl {{DP-1}} set-mode 1920x1080@60`
+
+- Set the scale of an output to 200%:
+
+`kscreenctl {{DP-1}} set-scale 200%`
+
+- Place an output to the right of another:
+
+`kscreenctl {{HDMI-A-1}} right-of {{DP-1}}`
+
+- Disable a specific output:
+
+`kscreenctl {{HDMI-A-1}} set-enabled false`
+
+- Turn all outputs off through Display Power Management Signaling:
+
+`kscreenctl off`