pamditherbw: edit page; atktopbm, pamenlarge, pbmreduce, pbmtext, pbmtextps, pbmtoatk, pbmtobbnbg; add pages (#12236)

* pamditherbw: edit page; atktopbm, pamenlarge, pbmreduce, pbmtext, pbmtextps, pbmtoatk, pbmtobbnbg; add pages

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Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

pages/common/pbmtext.md

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+# pbmtext
+
+> Render text as a PBM image.
+> See also: `pbmtextps`.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtext.html>.
+
+- Render a single line of text as a PBM image:
+
+`pbmtext "{{Hello World!}}" > {{path/to/output.pbm}}`
+
+- Render multiple lines of text as a PBM image:
+
+`echo "{{Hello\nWorld!}}" | pbmtext > {{path/to/output.pbm}}`
+
+- Render text using a custom font supplied as a PBM file:
+
+`pbmtext -font {{path/to/font.pbm}} "{{Hello World!}}" > {{path/to/output.pbm}}`
+
+- Specify the number of pixels between characters and lines:
+
+`echo "{{Hello\nWorld!}}" | pbmtext -space {{3}} -lspace {{10}} > {{path/to/output.pbm}}`