slurp: add page (#13459)

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Co-authored-by: spageektti <git@spageektti.cc>

pages/linux/slurp.md

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+# slurp
+
+> Select a region in a Wayland compositor.
+> More information: <https://github.com/emersion/slurp>.
+
+- Select a region and print it to `stdout`:
+
+`slurp`
+
+- Select a region and print it to `stdout`, while displaying the dimensions of the selection:
+
+`slurp -d`
+
+- Select a single point instead of a region:
+
+`slurp -p`
+
+- Select an output and print its name:
+
+`slurp -o -f '%o'`
+
+- Select a specific region and take a borderless screenshot of it, using `grim`:
+
+`grim -g "$(slurp -w 0)"`
+
+- Select a specific region and take a borderless video of it, using `wf-recorder`:
+
+`wf-recorder --geometry "$(slurp -w 0)"`