picttoppm, pnmtops, ppmtopict, ppmtopuzz, ppmtosixel, psidtopgm, pstopnm, qrttoppm: add pages (#11413)

pages/common/pnmtops.md

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+# pnmtops
+
+> Convert a PNM image to a PostScript file.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtops.html>.
+
+- Convert a PNM image to a PS file:
+
+`pnmtops {{path/to/file.pnm}} > {{path/to/file.ps}}`
+
+- Specify the dimensions of the output image in inches:
+
+`pnmtops -imagewidth {{imagewidth}} -imageheight {{imageheight}} {{path/to/file.pnm}} > {{path/to/file.ps}}`
+
+- Specify the dimensions of the page the output image resides on in inches:
+
+`pnmtops -width {{width}} -height {{height}} {{path/to/file.pnm}} > {{path/to/file.ps}}`