Update cheatsheets

pnmquant

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pnmquant
+
+> Quantize the colors in a PNM image into a smaller set.
+> This command is a combination of `pnmcolormap` and `pnmremap` and accepts the union of their options, except `-mapfile`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmquant.html>.
+
+- Generate an image using only `n_colors` or less colors as close as possible to the input image:
+
+`pnmquant {{n_colors}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`