pixterm: add page (#8411)

pages/common/pixterm.md

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+# pixterm
+
+> Image printing in the terminal.
+> See also: `chafa`, `catimg`.
+> More information: <https://github.com/eliukblau/pixterm>.
+
+- Render a static image directly in the terminal:
+
+`pixterm {{path/to/file}}`
+
+- Use the image's original aspect ratio:
+
+`pixterm -s 2 {{path/to/file}}`
+
+- Specify a custom aspect ratio using a specific number of [t]erminal [r]ows and [c]olumns:
+
+`pixterm -tr {{24}} -tc {{80}} {{path/to/file}}`
+
+- Filter the output with a [m]atte background color and character [d]ithering:
+
+`pixterm -m {{000000}} -d 2 {{path/to/file}}`