pamtowinicon, pgmtosbig, pgmtost4, ppmtowinicon, sbigtopgm, st4topgm, winicontopam, winicontoppm: add pages (#11404)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/pamtowinicon.md

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+# pamtowinicon
+
+> Convert a PAM image to a Windows ICO file.
+> More information: <https://netpbm.sourceforge.net/doc/pamtowinicon.html>.
+
+- Convert a PAM image file to an ICO file:
+
+`pamtowinicon {{path/to/input_file.pam}} > {{path/to/output.ico}}`
+
+- Encode images with resolutions smaller than t in the BMP format and all other images in the PNG format:
+
+`pamtowinicon -pngthreshold {{t}} {{path/to/input_file.pam}} > {{path/to/output.ico}}`
+
+- Make all pixels outside the non-opaque area black:
+
+`pamtowinicon -truetransparent {{path/to/input_file.pam}} > {{path/to/output.ico}}`

pages/common/pgmtosbig.md

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+# pgmtosbig
+
+> Convert a PGM image to the SBIG CCDOPS format.
+> More information: <https://netpbm.sourceforge.net/doc/pgmtosbig.html>.
+
+- Convert a PGM image file to the SBIG CCDOPS format:
+
+`pgmtosbig {{path/to/input_file.pgm}} > {{path/to/output.sbig}}`

pages/common/pgmtost4.md

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+# pgmtost4
+
+> Convert a PGM image to the SBIG ST-4 format.
+> More information: <https://netpbm.sourceforge.net/doc/pgmtost4.html>.
+
+- Convert a PGM image file to the SBIG ST-4 format:
+
+`pgmtost4 {{path/to/input_file.pgm}} > {{path/to/output.st4}}`

pages/common/ppmtowinicon.md

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+# ppmtowinicon
+
+> This command is superseded by `pamtowinicon`.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtowinicon.html>.
+
+- View documentation for the current command:
+
+`tldr pamtowinicon`

pages/common/sbigtopgm.md

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+# sbigtopgm
+
+> Convert an SBIG CCDOPS file to PGM.
+> More information: <https://netpbm.sourceforge.net/doc/sbigtopgm.html>.
+
+- Convert an SBIG CCDOPS image file to PGM:
+
+`sbigtopgm {{path/to/input_file.sbig}} > {{path/to/output.pgm}}`

pages/common/st4topgm.md

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+# st4topgm
+
+> Convert an SBIG ST-4 file to PGM.
+> More information: <https://netpbm.sourceforge.net/doc/st4topgm.html>.
+
+- Convert an SBIG ST-4 file to a PGM file:
+
+`st4topgm {{path/to/input_file.st4}} > {{path/to/output.pgm}}`

pages/common/winicontopam.md

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+# winicontopam
+
+> Convert a Windows ICO file to a PAM file.
+> More information: <https://netpbm.sourceforge.net/doc/winicontopam.html>.
+
+- Read an ICO file and convert the best quality image contained therein to the PAM format:
+
+`winicontopam {{path/to/input_file.ico}} > {{path/to/output.pam}}`
+
+- Convert all images in the input file to PAM:
+
+`winicontopam -allimages {{path/to/input_file.ico}} > {{path/to/output.pam}}`
+
+- Convert the n'th image in the input file to PAM:
+
+`winicontopam -image {{n}} {{path/to/input_file.ico}} > {{path/to/output.pam}}`
+
+- If the image(s) to be extracted contain graded transparency data and an AND mask, write the AND mask into the fifth channel of the output PAM file:
+
+`winicontopam -andmasks {{path/to/input_file.ico}} > {{path/to/output.pam}}`

pages/common/winicontoppm.md

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+# winicontoppm
+
+> This command is superseded by `winicontopam`.
+> More information: <https://netpbm.sourceforge.net/doc/winicontoppm.html>.
+
+- View documentation for the current command:
+
+`tldr winicontopam`