blurlock: add page, i3lock: refresh (#7399)

pages/linux/blurlock.md

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+# blurlock
+
+> A simple wrapper around the i3 screen locker `i3lock`, which blurs the screen.
+> See also: `i3lock`.
+> More information: <https://gitlab.manjaro.org/packages/community/i3/i3exit/-/blob/master/blurlock>.
+
+- Lock the screen to a blurred screenshot of the current screen:
+
+`blurlock`
+
+- Lock the screen and disable the unlock indicator (removes feedback on keypress):
+
+`blurlock --no-unlock-indicator`
+
+- Lock the screen and don't hide the mouse pointer:
+
+`blurlock --pointer {{default}}`
+
+- Lock the screen and show the number of failed login attempts:
+
+`blurlock --show-failed-attempts`