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/pbmtobbnbg.md

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+# pbmtobbnbg
+
+> Convert a PBM image to a BitGraph graphic.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtobbnbg.html>.
+
+- Convert a PBM image to a BitGraph terminal Display Pixel Data sequence:
+
+`pbmtobbnbg < {{path/to/image.pbm}} > {{path/to/output.dpd}}`
+
+- Specify the rasterop:
+
+`pbmtobbnbg {{3}} < {{path/to/image.pbm}} > {{path/to/output.dpd}}`