grim: add page (#9886)

Co-authored-by: Emily Grace Seville <EmilySeville7cfg@gmail.com>
Co-authored-by: Stian Lyng <stianlyng@protonamail.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/grim.md

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+# grim
+
+> Grab images (Screenshots) from a Wayland compositor.
+> More information: <https://sr.ht/~emersion/grim>.
+
+- Screenshot all outputs:
+
+`grim`
+
+- Screenshot a specific output:
+
+`grim -o {{path/to/output_file}}`
+
+- Screenshot a specific region:
+
+`grim -g "{{<x_position>,<y_position> <width>x<height>}}"`
+
+- Select a specific region and screenshot it, (using slurp):
+
+`grim -g "{{$(slurp)}}"`
+
+- Use a custom filename:
+
+`grim "{{path/to/file.png}}"`
+
+- Screenshot and copy to clipboard:
+
+`grim - | {{clipboard_manager}}`