kde-inhibit: add page (#4976)

pages/linux/kde-inhibit.md

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+# kde-inhibit
+
+> Inhibit various desktop functions while a command runs.
+
+- Inhibit power management:
+
+`kde-inhibit --power {{command}} {{command_arguments}}`
+
+- Inhibit screen saver:
+
+`kde-inhibit --screenSaver {{command}} {{command_arguments}}`
+
+- Launch vlc, and inhibit colour correction (night mode) while it's running:
+
+`kde-inhibit --colorCorrect {{vlc}}`