pcdindex, pcdovtoppm: add pages (#12389)

pages/common/pcdindex.md

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+# pcdindex
+
+> This command has been renamed to `pcdovtoppm`.
+> More information: <https://netpbm.sourceforge.net/doc/pcdindex.html>.
+
+- View documentation for the command under its current name:
+
+`tldr pcdovtoppm`

pages/common/pcdovtoppm.md

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+# pcdovtoppm
+
+> Create an index image for a photo CD based on its overview file.
+> More information: <https://netpbm.sourceforge.net/doc/pcdovtoppm.html>.
+
+- Create a PPM index image from a PCD overview file:
+
+`pcdovtoppm {{path/to/file.pcd}} > {{path/to/output.ppm}}`
+
+- Specify the [m]aximum width of the output image and the maximum [s]ize of each of the images contained in the output:
+
+`pcdovtoppm -m {{width}} -s {{size}} {{path/to/file.pcd}} > {{path/to/output.ppm}}`
+
+- Specify the maximum number of images [a]cross and the maximum number of [c]olours:
+
+`pcdovtoppm -a {{n_images}} -c {{n_colours}} {{path/to/file.pcd}} > {{path/to/output.ppm}}`
+
+- Use the specified [f]ont for annotations and paint the background [w]hite:
+
+`pcdovtoppm -a {{number}} -w {{path/to/file.pcd}} > {{path/to/output.ppm}}`